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"We are all the sum of our contradictions - that's what makes biography so fascinating."

The universe is a vast and mysterious place, and we are just beginning to understand its secrets.

It seems to me that if you or I must choose between two courses of thought or action, we should remember our dying and try so to live that our death brings no pleasure to the world.

The most important thing in communication is hearing what isn't said.

Natural selection has shaped our minds as well as our bodies.