Perpetual devotion to what a man calls his business, is only to be sustained by perpetual neglect of many other things.

The imagination loves to trifle with what is not.

It seems as if marriage were the royal road through life, and realised, on the instant, what we have all dreamed on summer Sundays when the bells ring, or at night when we cannot sleep for the desire of living. They think it will sober and change them. Like those who join a brotherhood, they fancy it needs but an act to be out of the coil and clamour for ever. But this is a wile of the devil's. To the end, spring winds will sow disquietude, passing faces leave a regret behind them, and the whole world keep calling and calling in their ears. For marriage is like life in this - that it is a field of battle, and not a bed of roses.

Decisive actions are often taken in a moment and without any conscious deliverance from the rational parts of man.

Fiction is to the grown man what play is to the child; it is there that he changes the atmosphere and tenor of his life.

It is as natural and as right for a young man to be imprudent and exaggerated, to live in swoops and circles, and beat about his cage like any other wild thing newly captured, as it is for old men to turn gray, or mothers to love their offspring, or heroes to die for something worthier than their lives.

If wine is to withdraw its most poetic countenance, the sun of the white dinner-cloth, a deity to be invoked by two or three, all fervent, hushing their talk, degusting tenderly, and storing reminiscences-for a bottle of good wine, like a good act, shines ever in the retrospect-if wine is to desert us, go thy ways, old Jack!

A good conscience is eight parts of courage.

People trifle with love. Now, I deny that love is a strong passion. Fear is the strong passion; it is with fear that you must trifle, if you wish to taste the intensest joys of living.

To know what you prefer, instead of humbly saying Amen to what the world tells you you ought to prefer, is to have kept your soul alive.

The time would fail me if I were to recite all the big names in history whose exploits are perfectly irrational and even shocking to the business mind. The incongruity is speaking; and I imagine it must engender among the mediocrities a very peculiar attitude, towards the nobler and showier sides of national life.

In many ways an artistic nature unfits a man for practical existence.

Our business in this world is not to succeed, but to continue to fail, in good spirits.

There is certainly some chill and arid knowledge to be found upon the summits of formal and laborious science; but it is all round about you, and for the trouble of looking, that you will acquire the warm and palpitating facts of life.

It is the worst of all quaint and of all cheap ways of life that they bring us at last to the pinch of some humiliation.

You could read Kant by yourself, if you wanted; but you must share a joke with someone else.

I confess I have no great notion of the use of books, except to amuse a railway journey; although, I believe, there are some very exact treatises on astronomy, the use of the globes, agriculture, and the art of making paper flowers. Upon the less apparent provinces of life I fear you will find nothing truthful.

To be what we are, and to become what we are capable of becoming, is the only end of life.

I suppose it is written that any one who sets up for a bit of a philosopher, must contradict himself to his very face. For here have I fairly talked myself into thinking that we have the whole thing before us at last; that there is no answer to the mystery, except that there are as many as you please; that there is no centre to the maze because, like the famous sphere, its centre is everywhere; and that agreeing to differ with every ceremony of politeness, is the only "one undisturbed song of pure concent" to which we are ever likely to lend our musical voices.

The wine is bottled poetry.

We do not go to cowards for tender dealing; there is nothing so cruel as panic; the man who has least fear for his own carcase, has most time to consider others.

Alas! in the clothes of the greatest potentate, what is there but a man?

Mankind was never so happily inspired as when it made a cathedral.

I shall doubtless outlive some troublesome desires; but I am in no hurry about that; nor, when the time comes, shall I plume myself on the immunity just in the same way, I do not greatly pride myself on having outlived my belief in the fairy tales of Socialism. Old people have faults of their own; they tend to become cowardly, niggardly, and suspicious. Whether from the growth of experience or the decline of animal heat, I see that age leads to these and certain other faults; and it follows, of course, that while in one sense I hope I am journeying towards the truth, in another I am indubitably posting towards these forms and sources of error.

To spendthrifts money is so living and actual-it is such a thin veil between them and their pleasures! There is only one limit to their fortune-that of time; and a spendthrift with only a few crowns is the Emperor of Rome until they are spent. For such a person to lose his money is to suffer the most shocking reverse, and fall from heaven to hell, from all to nothing, in a breath.

Another force driving progressive evolution is the so-called "arms-race." Prey animals evolve faster running speeds because predators do. Consequently predators have to evolve even faster running speeds, and so on, in an escalating spiral. Such arms races probably account for the spectacularly advanced engineering of eyes, ears, brains, bat "radar" and all the other high-tech weaponry that animals display.

You could give Aristotle a tutorial. And you could thrill him to the core of his being. Aristotle was an encyclopedic polymath, an all time intellect. Yet not only can you know more than him about the world, you also can have a deeper understanding of how everything works. Such is the privilege of living after Newton, Darwin, Einstein, Planck, Watson, Crick and their colleagues.

[W]hen the ricochets of atomic billiards chance to put together an object that has a certain, seemingly innocent property, something momentous happens in the universe. That property is an ability to self-replicate; that is, the object is able to use the surrounding materials to make exact copies of itself, including replicas of such minor flaws in copying as may occasionally arise. What will follow from this singular occurrence, anywhere in the universe, is Darwinian selection and hence the baroque extravaganza that, on this planet, we call life. Never were so many facts explained by so few assumptions. Not only does the Darwinian theory command superabundant power to explain. Its economy in doing so has a sinewy elegance, a poetic beauty that outclasses even the most haunting of the world's origin myths. Preface

In fact writing a computer program is a pretty good way to summarize knowledge about any set of rules.

There's nothing nonsensical about saying that what would evolve if Darwinian selection has its head is something that you don't want to happen. And I could easily imagine trying to go against Darwinism.

Think about the two qualities that a virus, or any sort of parasitic replicator, demands of a friendly medium, the two qualities that make cellular machinery so friendly towards parasitic DNA, and that make computers so friendly towards computer viruses. These qualities are, firstly, a readiness to replicate information accurately, perhaps with some mistakes that are subsequently reproduced accurately; and, secondly, a readiness to obey instructions encoded in the information so replicated.

How do we account for the current paranormal vogue in the popular media? Perhaps it has something to do with the millennium - in which case it's depressing to realise that the millennium is still three years away.

Scientific beliefs are supported by evidence, and they get results. Myths and faiths are not and do not.

It may be that brain hardware has co-evolved with the internal virtual worlds that it creates. This can be called hardware-software co-evolution.

For the first half of geological time our ancestors were bacteria. Most creatures still are bacteria, and each one of our trillions of cells is a colony of bacteria.

In one way or another, all my books have been devoted to expounding and exploring the almost limitless power of the Darwinian principle-power unleashed whenever and wherever there is enough time for the consequences of primordial self-replication to unfold. Preface

Natural selection is an extremely simple process, in the sense that very little machinery needs to be set up in order for it to work. Of course the effects and consequences of natural selection are complex in the extreme. But in order to set natural selection going on a real planet, all that is required is the existence of inherited information.

The world and the universe is an extremely beautiful place, and the more we understand about it the more beautiful does it appear. It is an immensely exciting experience to be born in the world, born in the universe, and look around you and realise that before you die you have the opportunity of understanding an immense amount about that world and about that universe and about life and about why we're here. We have the opportunity of understanding far, far more than any of our predecessors ever. That is such an exciting possibility, it would be such a shame to blow it and end your life not having understood what there is to understand.

The second requirement of a virus-friendly environment - that it should obey a program of coded instructions - is again only quantitatively less true for brains than for cells or computers. We sometimes obey orders from one another, but also we sometimes don't. Nevertheless, it is a telling fact that, the world over, the vast majority of children follow the religion of their parents rather than any of the other available religions. Instructions to genuflect, to bow towards Mecca, to nod one's head rhythmically towards the wall, to shake like a maniac, to "speak in tongues" - the list of such arbitrary and pointless motor patterns offered by religion alone is extensive - are obeyed, if not slavishly, at least with some reasonably high statistical probability.

The popularity of the paranormal, oddly enough, might even be grounds for encouragement. I think that the appetite for mystery, the enthusiasm for that which we do not understand, is healthy and to be fostered. It is the same appetite which drives the best of true science, and it is an appetite which true science is best qualified to satisfy.

Never say, and never take seriously anyone who says, "I cannot believe that so-and-so could have evolved by gradual selection". I have dubbed this kind of fallacy "the Argument from Personal Incredulity". Time and again, it has proven the prelude to an intellectual banana-skin experience.

It is an article of passionate faith among "politically correct" biologists and anthropologists that brain size has no connection with intelligence; that intelligence has nothing to do with genes; and that genes are probably nasty fascist things anyway.

It has become almost a cliché to remark that nobody boasts of ignorance of literature, but it is socially acceptable to boast ignorance of science and proudly claim incompetence in mathematics.

The total amount of suffering per year in the natural world is beyond all decent contemplation. During the minute it takes me to compose this sentence, thousands of animals are being eaten alive; others are running for their lives, whimpering with fear; others are being slowly devoured from within by rasping parasites; thousands of all kinds are dying of starvation, thirst and disease. [...] In a universe of blind physical forces and genetic replication, some people are going to get hurt, other people are going to get lucky, and you won't find any rhyme or reason in it, nor any justice. The universe we observe has precisely the properties we should expect if there is, at bottom, no design, no purpose, no evil and no good, nothing but blind, pitiless indifference. DNA neither knows nor cares. DNA just is. And we dance to its music.

To this day, and in quarters where they should know better, Darwinism is widely regarded as a theory of 'chance'.It is grindingly, creakingly, crashingly obvious that, if Darwinism were really a theory of chance, it couldn't work. You don't need to be a mathematician or physicist to calculate that an eye or a haemoglobin molecule would take from here to infinity to self-assemble by sheer higgledy-piggledy luck. Far from being a difficulty peculiar to Darwinism, the astronomic improbability of eyes and knees, enzymes and elbow joints and the other living wonders is precisely the problem that any theory of life must solve, and that Darwinism uniquely does solve.

Maybe somewhere in some other galaxy there is a super-intelligence so colossal that from our point of view it would be a god. But it cannot have been the sort of God that we need to explain the origin of the universe, because it cannot have been there that early.

Ten years ago, you could have traveled thousands of miles through the United States and never seen a baseball cap turned back to front. Today, the reverse baseball cap is ubiquitous. I do not know what the pattern of geographical spread of the reverse baseball cap precisely was, but epidemiology is certainly among the professions primarily qualified to study it.

You contain a trillion copies of a large, textual document written in a highly accurate, digital code, each copy as voluminous as a substantial book. I'm talking, of course, of the DNA in your cells.

Nature is not cruel, only pitilessly indifferent. This is one of the hardest lessons for humans to learn. We cannot admit that things might be neither good nor evil, neither cruel nor kind, but simply callous - indifferent to all suffering, lacking all purpose.

The likelihood is that, in 100,000 years time, we shall either have reverted to wild barbarism, or else civilisation will have advanced beyond all recognition - into colonies in outer space, for instance. In either case, evolutionary extrapolations from present conditions are likely to be highly misleading.