As a believing scientist it is my deep conviction that it is our task to search nature and the universe, as Galileo Galilei, the father of modern science, did, for the footprints of God.

Measure what is measurable, and make measurable what is not so.

Mathematics is the key and door to the sciences.

It is only in order to shield your ignorance that you put the Lord at every turn to the refuge of a miracle.

I have never met a man so ignorant that I could not learn something from him.

All truths are easy to understand once they are discovered; the point is to discover them.

Names and attributes must be accommodated to the essence of things, and not the essence to the names, since things come first and names afterwards.

Wine is a mixture of moisture and light.

Alas! Your dear friend and servant Galileo has been for the last month hopelessly blind; so that this heaven, this earth, this universe, which I by my marvelous discoveries and clear demonstrations had enlarged a hundred thousand times beyond the belief of the wise men of bygone ages, henceforward for me is shrunk into such a small space as is filled by my own bodily sensations.

I have been in my bed for five weeks, oppressed with weakness and other infirmities from which my age, seventy four years, permits me not to hope release. Added to this (proh dolor! [O misery!]) the sight of my right eye — that eye whose labors (dare I say it) have had such glorious results — is for ever lost. That of the left, which was and is imperfect, is rendered null by continual weeping.