The formulation of the problem is often more essential than its solution, which may be merely a matter of mathematical or experimental skill.

When you examine the lives of the most influential people who have ever walked among us, you discover one thread that winds through them all. They have been aligned first with their spiritual nature and only then with their physical selves.

Make everything as simple as possible, but not simpler.

Joy and amazement of the beauty and grandeur of this world of which man can just form a faint notion.

In a healthy nation there is a kind of dramatic balance between the will of the people and the government, which prevents its degeneration into tyranny.

The really valuable method of thought to arrive at a logically coherent system is intuition.

A theory is the more impressive the greater is the simplicity of its premises, the more different are the kinds of things it relates and the more extended the range of its applicability.