MacTutor
Men pass away, but their deeds abide.
√-1 we can repudiate completely and which we can abandon without regret because one does not know what this pretended sign signifies nor what sense one ought to attribute to it.
As for methods I have sought to give them all the rigour that one requires in geometry, so as never to have recourse to the reasons drawn from the generality of algebra.
I get up at four o'clock each morning and I am busy from then on. … I do not get tired of
working; on the contrary, it invigorates me and I am in perfect health …
... very often the laws derived by physicists from a large number of observations are not rigorous, but approximate.