Paul Dirac Equations Quotations

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

It is more important to have beauty in one's equations than to have them fit experiment.

I consider that I understand an equation when I can predict the properties of its solutions, without actually solving it.

A good deal of my research in physics has consisted in not setting out to solve some particular problem, but simply examining mathematical equations of a kind that physicists use and trying to fit them together in an interesting way, regardless of any application that the work may have. It is simply a search for pretty mathematics. It may turn out later to have an application. Then one has good luck. At age 78.