"The true beginning of all knowledge is the discovery of something we do not know."

"I have also a paper afloat, with an electromagnetic theory of light, which, till I am convinced to the contrary, I hold to be great guns."

"The only way of discovering the extent of the laws of nature is to try to transcend them."

"The mind can only attend to one thing at a time."

"The first thing that I always do is to try to understand the problem."