It is always noteworthy that all those who seriously study this science [the theory of numbers] conceive a sort of passion for it.

Theory attracts practice as the magnet attracts iron.

I am giving this winter two courses of lectures to three students, of which one is only moderately prepared, the other less than moderately, and the third lacks both preparation and ability. Such are the onera of a mathematical profession.

If others would but reflect on mathematical truths as deeply and as continuously as I have, they would make my discoveries.

For three days now this angel, almost too heavenly for earth has been my fiancée ... Life stands before me like an eternal spring with new and brilliant colours. Upon his engagement to Johanne Osthof of Brunswick; they married 9 Oct 1805.

Mathematical discoveries, like springtime violets in the woods, have their season which no human can hasten or retard.

When a philosopher says something that is true then it is trivial. When he says something that is not trivial then it is false.