I have made up my mind that if there is a God, he will be merciful to the merciful. Upon that rock I stand. That he will not torture the forgiving. Upon that rock I stand. That every man should be true to himself, and that there is no world, no star in which honesty is a crime. Upon that rock I stand.

It is an old habit with theologians to beat the living with the bones of the dead.

Talent has the four seasons: spring, that is to say, the sowing of the seeds; summer, growth; autumn, the harvest; winter, intellectual death. But there is now and then a genius who has no winter, and, no matter how many years he may live, on the blossom of his thought no snow falls. Genius has the climate of perpetual growth.

Custom meets us at the cradle and leaves us only at the tomb.

Truth is the mother of joy. Truth civilizes, ennobles and purifies. The grandest ambition that can enter the soul is to know the truth.

Let us agree not to step on each other’s feet.

Reason, observation, and experience; the holy trinity of science.