I think it is the general rule that the originator of a new idea is not the most suitable person to develop it, because his fears of something going wrong are really too strong... At age 69.

A great deal of my work is just playing with equations and seeing what they give.

It seems that if one is working from the point of view of getting beauty in one's equations, and if one has really a sound insight, one is on a sure line of progress.

Theoretical physicists accept the need for mathematical beauty as an act of faith... For example, the main reason why the theory of relativity is so universally accepted is its mathematical beauty.

Pick a flower on Earth and you move the farthest star.

Living is worthwhile if one can contribute in some small way to this endless chain of progress.

A book on the new physics, if not purely descriptive of experimental work, must essentially be mathematical.