I am sitting with a philosopher in the garden; he says again and again "I know that that's a tree", pointing to a tree that is near us. Someone else arrives and hears this, and I tell them: "This fellow isn't insane. We are only doing philosophy."

At the end of reasons comes persuasion.

You get tragedy where the tree, instead of bending, breaks.

A new word is like a fresh seed sown on the ground of the discussion.

Man has to awaken to wonder - and so perhaps do peoples. Science is a way of sending him to sleep again.

I squander untold effort making an arrangement of my thoughts that may have no value whatever.

A confession has to be part of your new life.

Philosophers often behave like little children who scribble some marks on a piece of paper at random and then ask the grown-up "What's that?" - It happened like this: the grown-up had drawn pictures for the child several times and said "this is a man," "this is a house," etc. And then the child makes some marks too and asks: what's this then?

You always hear people say that philosophy makes no progress and that the same philosophical problems which were already preoccupying the Greeks are still troubling us today. But people who say that do not understand the reason why it has to be so. The reason is that our language has remained the same and always introduces us to the same questions. ... I read: "philosophers are no nearer to the meaning of 'Reality' than Plato got,...". What a strange situation. How extraordinary that Plato could have got even as far as he did! Or that we could not get any further! Was it because Plato was so extremely clever?

Reading the Socratic dialogues one has the feeling: what a frightful waste of time! What's the point of these arguments that prove nothing and clarify nothing?

If someone is merely ahead of his time, it will catch up to him one day.

If you use a trick in logic, whom can you be tricking other than yourself?

The world is the totality of facts, not things.

This remark provides the key to the problem, how much truth there is in solipsism. For what the solipsist means is quite correct; only it cannot be said, but makes itself manifest. The world is my world: this is manifest in the fact that the limits of language (of that language which alone I understand) mean the limits of my world.

The world is all that is the case.

The aim of the book is to set a limit to thought, or rather - not to thought, but to the expression of thoughts: for in order to be able to set a limit to thought, we should have to find both sides of the limit thinkable (i.e. we should have to be able to think what cannot be thought). It will therefore only be in language that the limit can be set, and what lies on the other side of the limit will simply be nonsense.

Don't get involved in partial problems, but always take flight to where there is a free view over the whole single great problem.

It is clear that the causal nexus is not a nexus at all.

What is the case, the fact, is the existence of atomic facts.

The logical picture of the facts is the thought.

The thought is the significant proposition.

The limits of my language mean the limits of my world. 

The world and life are one.

I am my world.

Death is not an event in life: we do not live to experience death. If we take eternity to mean not infinite temporal duration but timelessness, then eternal life belongs to those who live in the present. Our life has no end in just the way in which our visual field has no limits.

It is not how things are in the world that is mystical, but that it exists.

Scepticism is not irrefutable, but obviously nonsensical, when it tries to raise doubts where no questions can be asked. For doubt can exist only where a question exists, a question only where an answer exists, and an answer only where something can be said.

What cannot be imagined cannot even be talked about.

It is true: Man is the microcosm: I am my world.

I work quite diligently and wish that I were better and smarter. And these both are one and the same.

You won't - I really believe - get too much out of reading it. Because you won't understand it; the content will seem strange to you. In reality, it isn't strange to you, for the point is ethical. I once wanted to give a few words in the foreword which now actually are not in it, which, however, I'll write to you now because they might be a key for you: I wanted to write that my work consists of two parts: of the one which is here, and of everything which I have not written. And precisely this second part is the important one.

"It is necessary to be given the prop that all elementary props are given." This is not necessary because it is even impossible. There is no such prop! That all elementary props are given is SHOWN by there being none having an elementary sense which is not given.

One often makes a remark and only later sees how true it is.

Logic takes care of itself; all we have to do is to look and see how it does it.

Don't get involved in partial problems, but always take flight to where there is a free view over the whole single great problem, even if this view is still not a clear one.

My difficulty is only an - enormous - difficulty of expression.

I cannot get from the nature of the proposition to the individual logical operations!!! That is, I cannot bring out how far the proposition is the picture of the situation. I am almost inclined to give up all my efforts.

It is one of the chief skills of the philosopher not to occupy himself with questions which do not concern him.

Language is a part of our organism and no less complicated than it.

One of the most difficult of the philosopher's tasks is to find out where the shoe pinches.

Certainly it is correct to say: Conscience is the voice of God.

What do I know about God and the purpose of life? I know that this world exists. That I am placed in it like my eye in its visual field. That something about it is problematic, which we call its meaning. This meaning does not lie in it but outside of it. That life is the world. That my will penetrates the world. That my will is good or evil. Therefore that good and evil are somehow connected with the meaning of the world. The meaning of life, i.e. the meaning of the world, we can call God. And connect with this the comparison of God to a father. To pray is to think about the meaning of life.

To believe in a God means to understand the question about the meaning of life. To believe in a God means to see that the facts of the world are not the end of the matter. To believe in God means to see that life has a meaning.

There are two godheads: the world and my independent I. I am either happy or unhappy, that is all. It can be said: good or evil do not exist. A man who is happy must have no fear. Not even in the face of death. Only a man who lives not in time but in the present is happy.

The World and Life are one. Physiological life is of course not "Life". And neither is psychological life. Life is the world. Ethics does not treat of the world. Ethics must be a condition of the world, like logic. Ethics and Aesthetics are one.

Every explanation is after all an hypothesis.

There are, indeed, things that cannot be put into words. They make themselves manifest. They are what is mystical.

A proposition is completely logically analyzed if its grammar is made completely clear: no matter what idiom it may be written or expressed in...

The problems are dissolved in the actual sense of the word - like a lump of sugar in water.

Philosophical problems can be compared to locks on safes, which can be opened by dialing a certain word or number, so that no force can open the door until just this word has been hit upon, and once it is hit upon any child can open it.