There are two different types of people in the world, those who want to know, and those who want to believe.

It is not a lack of love, but a lack of friendship that makes unhappy marriages.

What is the truth, but a lie agreed upon.

Truth is a mobile army of metaphors, metonyms, anthropomorphisms, in short a sum of human relations which have been subjected to poetic and rhetorical intensification, translation and decoration […]; truths are illusions of which we have forgotten that they are illusions, metaphors which have become worn by frequent use and have lost all sensuous vigour […]. Yet we still do not know where the drive to truth comes from, for so far we have only heard about the obligation to be truthful which society imposes in order to exist" from, "On Truth and Lying in a Non-Moral Sense".

A man far oftener appears to have a decided character from persistently following his temperament than from persistently following his principles.

Those with certain temperaments find no way to endure themselves except by striving towards going under.

The thousand mysteries around us would not trouble but interest us, if only we had cheerful, healthy hearts.