I am indeed amazed when I consider how weak my mind is and how prone to error.

We do not describe the world we see, we see the world we can describe.

The reading of all good books is indeed like a conversation with the noblest men of past centuries who were the authors of them, nay a carefully studied conversation, in which they reveal to us none but the best of their thoughts.

We never understand a thing so well,and make it our own, as when we have discovered it for ourselves.

Mathematics is a more powerful instrument of knowledge than any other that has been bequeathed to us by human agency.

Now therefore, that my mind is free from all cares, and that I have obtained for myself assured leisure in peaceful solitude, I shall apply myself seriously and freely to the general destruction of all my former opinions.

In God there is an infinitude of things which I cannot comprehend, nor possibly even reach in any way by thought; for it is the nature of the infinite that my nature, which is finite and limited, should not comprehend it.