The bitter and the sweet come from the outside, the hard from within, from one's own efforts.

Adversity introduces a man to himself.

E=mc2. Energy equals mass times the speed of light squared. The original statement is: If a body gives off the energy L in the form of radiation, its mass diminishes by L/c2. Ist die Tragheit eines Korpers von Seinem Energieghalt Abhangig? 1905

Figuring out how to think about the problem.

The supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a simple datum of experience.

It is easy to say something new, if all senses one will eschew. But hardly ever is found, that the new is also sound.

The analogy I like is this imagine being able to see the world but you are deaf, and then suddenly someone gives you the ability to hear things as well - you get an extra dimension of perception.