The possession of knowledge does not kill the sense of wonder and mystery. There is always more mystery.
The mystery of the beginning of all things is insoluble by us; and I for one must be content to remain an agnostic.
The most beautiful experience we can have is the mysterious. It is the fundamental emotion that stands at the cradle of true art and true science.
People like you and me, though mortal, of course, like everyone else, do not grow old no matter how long we live. What I mean is that we never cease to stand like curious children before the great Mystery into which we were born.
Man is a mystery. One must solve it. If you spend your entire life trying to puzzle it out, then do not say that you have wasted your time. I occupy myself with this mystery, because I want to be a man.