The whole [scientific] process resembles biological evolution. A problem is like an ecological niche, and a theory is like a gene or a species which is being tested for viability in that niche.

You can't beat yourself up anymore, ' he says. 'And you can't compare your thing to my thing or to anyone else's thing on the how-bad-should-I-feel? scale.

Be courageous. Get out of your comfort zone to live fully and abundantly.

What Jesus said we could do is leave typical behind.

My advice to any diplomat who wants to have good press is to have two or three kids and a dog.

Your smile brightens the lives of all who see it. To someone who has seen a dozen people frown, scowl or turn their faces away, your smile is like the sun breaking through the clouds.

When we reflect on the shortness and uncertainty of life, how despicable seem all our pursuits of happiness.

Anyone can train hard. Do you have the discipline to recover?

We all have that possibility, that potential and that promise of seeing beyond the seeming.

An implicit confession is almost as bad as an implicit faith; wicked men commonly confess their sins by wholesale, We are all sinners; but the true penitent confesses his sins by retail.

I will make you love physics and your life will never be the same.