Richard P. Feynman Quotes

Experiment is the sole source of truth.

Experiment is the only means of knowledge at our disposal. Everything else is poetry, imagination.

Facts are the air of scientists. Without them you can never fly.

The true method of knowledge is experiment.

The strongest arguments prove nothing so long as the conclusions are not verified by experience. Experimental science is the queen of sciences and the goal of all speculation.

A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.

I venture to define science as a series of interconnected concepts and conceptual schemes arising from experiment and observation and fruitful of further experiments and observations. The test of a scientific theory is, I suggest, its fruitfulness.

Science is the acceptance of what works and the rejection of what does not. That needs more courage than we might think.

Science walks forward on two feet, namely theory and experiment.

We must have the real thing before we can have a science of a thing.

Experiment is the sole source of truth. It alone can teach us something new; it alone can give us certainty.

Science is a combination of theory and experiment and the two together are how you make progress.

A fact is a simple statement that everyone believes. It is innocent, unless found guilty. A hypothesis is a novel suggestion that no one wants to believe. It is guilty, until found effective.

Just as houses are made of stones, so is science made of facts.

The ultimate court of appeal is observation and experiment... not authority.

The work of science is to substitute facts for appearances, and demonstrations for impressions.

Experience by itself is not science.

Science has fulfilled her function when she has ascertained and enunciated truth.

Just as houses are made of stone, so is science made of facts; but a pile of stones is not a house, and a collection of facts is not necessarily science

It is not observation but theory that led me to this result that experience has confirmed afterwards.

if the result confirms the hypothesis, then you've made a measurement. If the result is contrary to the hypothesis, then you've made a discovery.

Avoid the precepts of those thinkers whose reasoning is not confirmed by experience.

There are three principal means of acquiring knowledge available to us: observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination.

Something my father dearly loved is the scientific method, and it's founded in this element of humility. The idea is that you pursue the truth wherever it goes; you need to evidence, and you can - you see if it's repeatable.

The facts will eventually test all our theories, and they form, after all, the only impartial jury to which we can appeal.