I can live with doubt and uncertainty and not knowing. I think it is much more interesting to live not knowing than to have answers that might be wrong. If we will only allow that, as we progress, we remain unsure, we will leave opportunities for alternatives. We will not become enthusiastic for the fact, the knowledge, the absolute truth of the day, but remain always uncertain … In order to make progress, one must leave the door to the unknown ajar.
Richard P. FeynmanI find that teaching and the students keep life going, and I would never accept any position in which somebody has invented a happy situation for me where I don't have to teach. Never.
Richard P. FeynmanThe test of all knowledge is experiment. Experiment is the sole judge of scientific truth.
Richard P. FeynmanWe can deduce, often, from one part of physics like the law of gravitation, a principle which turns out to be much more valid than the derivation.
Richard P. FeynmanIt is not unscientific to make a guess, although many people who are not in science think it is.
Richard P. Feynman