In the kingdom of ends everything has either a price or a dignity. Whatever has a price can be replaced by something else as its equivalent; on the other hand, whatever is above all price, and therefore admits of no equivalent, has a dignity. But that which constitutes the condition under which alone something can be an end in itself does not have mere relative worth, i.e., price, but an intrinsic worth, i.e., a dignity.
If a traveller does not meet with one who is his better, or his equal, let him firmly keep to his solitary journey; there is no companionship with a fool.
What matters it to me if someone does not understand this? Let him too rejoice and say, “What is this?” Let him rejoice even at this, and let him love to find you while not finding it out, rather than, while finding it out, not to find you.
And certainly once a man begins to neglect his domestic duties he becomes painfully effeminate, does he not? And I don't like that. It makes men so very attractive.
Science is about finding ever better approximations rather than pretending you have already found ultimate truth.
A casual stroll through the lunatic asylum shows that faith does not prove anything.
At any rate, when a subject is highly controversial-and any question about sex is that-one cannot hope to tell the truth. One can only show how one came to hold whatever opinion one does hold.