The test of all knowledge is experiment. Experiment is the sole judge of scientific truth.
Richard P. FeynmanVictory usually goes to those green enough to underestimate the monumental hurdles they are facing.
Richard P. FeynmanIt's amazing how many people even today use a computer to do something you can do with a pencil and paper in less time.
Richard P. FeynmanAny schemes - such as 'think of symmetry laws', or 'put the information in mathematical form', or 'guess equations'- are known to everybody now, and they are all tried all the time. When you are stuck, the answer cannot be one of these, because you will have tried these right away...The next scheme, the new discovery, is going to be made in a completely different way.
Richard P. Feynman