People make the mistake of talking about 'natural laws.' There are no natural laws. There are only temporary habits of nature.
The guiding motto in the life of every natural philosopher should be, seek simplicity and distrust it.
Common sense is genius in homespun.
Fundamental progress has to do with the reinterpretation of basic ideas.
The pursuit of mathematics is a divine madness of the human spirit.
An open mind is all very well in its way, but it ought not to be so open that there is no keeping anything in or out of it.