Pure mathematics is, in its way, the poetry of logical ideas. ... [By seeking] logical beauty spiritual formulas are discovered necessary for the deeper penetration into the laws of nature.

The more I learn, the more I realize I don't know.

... one does people the best service by giving them some elevating work to do and thus indirectly elevating them.

There is no greater satisfaction for a just and well-meaning person than the knowledge that he has devoted his best energies to the service of the good cause.

Time is relative; its only worth depends upon what we do as it is passing.

It is really a puzzle what drives one to take one's work so devilishly seriously.

Gravitation is not responsible for people falling in love.