A priori Logical propositions are such as can be known a priori without study of the actual world.

For over two thousand years it has been the custom among earnest moralists to decry happiness as something degraded and unworthy

Thought is merciless to privilege, established institutions, and comfortable habit.

Laughter is the most inexpensive and most effective wonder drug. Laughter is a universal medicine.

Men fear thought as they fear nothing else on earth - more than ruin, more even than death.

I am myself a dissenter from all known religions, and I hope that every kind of religious belief will die out.

I would never die for my beliefs because I might be wrong.