For some natures, changing their opinions is just as much a requirement of cleanliness as changing their clothes: for others, however, it is merely a requirement of vanity.

Was that life? Well then, once more!

Some are made modest by great praise, others insolent.

One has to take a somewhat bold and dangerous line with this existence: especially as, whatever happens, we are bound to lose it.

A man who wills commands something within himself that renders obedience, or that he believes renders obedience.

Mathematics would certainly have not come into existence if one had known from the beginning that there was in nature no exactly straight line, no actual circle, no absolute magnitude.

Death. The certain prospect of death could sweeten every life with a precious and fragrant drop of levity- and now you strange apothecary souls have turned it into an ill-tasting drop of poison that makes the whole of life repulsive.