There are two classes [of scientists], those who want to know, and do not care whether others think they know or not, and those who do not much care about knowing, but care very greatly about being reputed as knowing.
Think of and look at your work as though it were done by your enemy. I you look at it to admire it, you are lost.
Let us eat and drink neither forgetting death unduly nor remembering it. The Lord hath mercy on whom he will have mercy, etc., and the less we think about it the better.
Christ was only crucified once and for a few hours. Think of the hundreds of thousands whom Christ has been crucifying in a quiet way ever since.
There is nothing so unthinkable as thought, unless it be the entire absence of thought.