The only reactionaries are those who find themselves at home in the present.

Scholasticism, a concept which does not bear criticism, is a theological concept specifically designed to sustain faith in the immortality of the soul.

Cure yourself of the affliction of caring how you appear to others. Concern yourself only with how you appear before God, concern yourself only with the idea that God may have of you.

Fear is the start of wisdom.

Philosophy fulfills the need to create for ourselves a single and complete concept of the world and of life.

Faith which does not doubt is dead faith.

Science says: 'We must live,' and seeks the means of prolonging, increasing, facilitating and amplifying life, of making it tolerable and acceptable, wisdom says: 'We must die,' and seeks how to make us die well.