I used to climb mountains in snow and ice, hanging onto the sides of great rocks. I was describing one of my adventures to an older friend once, and … - Heinz Pagels

Mountain climbing is an analogue of the research process in theoretical physics. In working on a problem in physics one is never assured of a solution, because there are many false leads and pitfalls. Likewise in climbing there is no certainty of attaining the summit; the route is often unknown, or sometimes one attains a false summit. But the important point is that if you reach the top, the view is enormous. There is no comparison between what you see from just below the summit and what you can see from the top. Similarly with finally solving an important problem in physics the view you get is enormous.

I often dream about falling. Such dreams are commonplace to the ambitious or those who climb mountains. Lately I dreamed I was clutching at the face of a rock but it would not hold. Gravel gave way. I grasped for a shrub, but it pulled loose, and in cold terror I fell into the abyss. Suddenly I realized that my fall was relative; there was no bottom and no end. A feeling of pleasure overcame me. I realized that what I embody, the principle of life, cannot be destroyed. It is written into the cosmic code, the order of the universe. As I continued to fall in the dark void, embraced by the vault of the heavens, I sang to the beauty of the stars and made my peace with the darkness.

Perhaps our thinking exemplifies a selective system. First lots of random scattered ideas compete for survival. Then comes the selection for what works best — one idea dominates, and this is followed by its amplification. Perhaps the moral [...] is that you never learn anything unless you are willing to take a risk and tolerate a little randomness in your life.