Truth is arrived at through rational reflection and observation of the natural world.
The Langlands program is a challenge to our understanding of the nature of mathematical truth.
The mind is a biological achievement of the highest order.
No matter how good you get you can always get better, and that's the exciting part.
Man is not logical and his intellectual history is a record of mental reserves and compromises. He hangs on to what he can in his old beliefs even when he is compelled to surrender their logical basis.