Man, being the servant and interpreter of Nature, can do and understand so much and so much only as he has observed in fact or thought of the course of nature; beyond this he neither knows anything nor can do anything.

I don't think people are born artists; I think it comes from a mixture of your surroundings, the people you meet, and luck.

It is not the lie that passeth through the mind, but the lie that sinketh in and settleth in it, that doth the hurt.

Friends are thieves of time.

In mathematics I can report no deficiency, except it be that men do not sufficiently understand the excellent use of Pure Mathematics.

Aristotle... a mere bond-servant to his logic, thereby rendering it contentious and well nigh useless.

When I paint I am ageless, I just have the pleasure or the difficulty of painting.