It is no small art to sleep: for that purpose you must keep awake all day.
The smallest minority on earth is the individual. Those who deny individual rights cannot claim to be defenders of minorities.
Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.
Rationality attracts conscientious humans, whereas mysticism attracts fools.
All real philosophers have been artists in the realm of concepts.
Every cause produces more than one effect.
A concept is a brick. It can be used to build a courthouse of reason. Or it can be thrown through the window.
Maybe true travel is not the transportation of the body, but a change of perception, renewing the mind.
The intuitive mind is a sacred gift – and the rational mind is a faithful servant. – We have created a society that honors the servant – and has forgotten the gift.