At the beginning of a marriage ask yourself whether this woman will be interesting to talk to from now until old age. Everything else in marriage is transitory: most of the time is spent in conversation.
There are highly gifted spirits who are always infertile simply because, owing to a weakness in temperament, they are too impatient to wait out their pregnancy to term.
Natural death is independent of all reason and is really an irrational death, in which the pitiable substance of the shell determines how long the kernel is to exist or not; in which, accordingly, the stunted, diseased and dull witted jailer is lord, and indicates the moment at which his distinguished prisoner shall die.
[Heraclitus] did not require humans or their sort of knowledge, since everything into which one may inquire he despises [as being] in contrast [to his own] inward-turning wisdom. [To him] all learning from others is a sign of nonwisdom, because the wise man focuses his vision on his own intelligence.
The finest and healthiest thing about science is, as in the mountains, the brisk air blowing around in it.--The spiritually delicate (such as artists) shun and slander science owing to this air.
God is Dead; but given the way of men, there may still be caves for thousands of years in which his shadow will be shown. And we - we still have to vanquish his shadow, too.