Man's Duty Is To Improve Himself; To

A Man Who Has Tasted With Profound Enjoyment The Pleasure Of Agreeable Society Will Eat With A Greater Appetite Than He Who Rode Horseback For Two Hours. An Amusing Lecture Is As Useful For Health As The Exercise Of The Body.

God, Freedom, And Immortality Are Untenable In The Light Of Pure Reason.

But Only He Who, Himself Enlightened, Is Not Afraid Of Shadows.

What Can I Know? What Ought I To Do? What May I Hope?

In The Mere Concept Of One Thing It Cannot Be Found Any Character Of Its Existence.