You either choose this method of passing the evening because you are in each other's confidence, and have secret affairs to discuss, or because you are conscious that your figures appear to the greatest advantage in walking;— if the first, I should be completely in your way, and if the second, I can admire you much better as I sit by the fire.
The comprehensibility of the world seems to me a wonder or eternal secret. Here lies the sense of wonder which increases even more with the development of our knowledge.
We have all our private terrors, our particular shadows, our secret fears. We are afraid in a fear which we cannot face, which none understands, and our hearts are torn from us, our brains unskinned like the layers of an onion, ourselves the last.
Science ... looks skeptically at all claims to knowledge, old and new. It teaches not blind obedience to those in authority but to vigorous debate, and in many respects that's the secret of its success.
You can't lose what you serve. That's the secret. What you serve, you can't lose. What you don't serve and what you try to hold onto, you can't hold onto. It's always slipping out of your fingers.
The cabinets of the sick and the closets of the dead have been ransacked to publish private letters and divulge to all mankind the most secret sentiments of friendship.
My turning point was my pilgrimage to Santiago de Compostela. It was then that I, who had dedicated most of my life to penetrate the 'secrets' of the universe, realized that there are no secrets. Life is and will always be a mystery.