Theory quotes

I believe the process of going from confusion to understanding is a precious, even emotional, experience that can be the foundation of self-confidence. String theory has the potential to show that all of the wondrous happenings in the universe - from the frantic dance of subatomic quarks to the stately waltz of orbiting binary stars; from the primordial fireball of the big bang to the majestic swirl of heavenly galaxies - are reflections of one, grand physical principle, one master equation. Einstein's theory of relativity does a fantastic job for explaining big things.
Quantum mechanics is fantastic for the other end of the spectrum - for small things.
Before the discovery of quantum mechanics, the framework of physics was this: If you tell me how things are now, I can then use the laws of physics to calculate, and hence predict, how things will be later. If the theory turns out to be right, that will be tremendously thick and tasty icing on the cake.