David Deutsch Quotes

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

I really do think that science has an internal structure, and it makes sense, and we can test it.

It is a test of true theories not only to account for but to predict phenomena.

Science does not limit itself merely to what is currently verifiable. But it is interested in questions that are potentially verifiable (or, rather, falsifiable).

Science is defined in various ways, but today it is generally restricted to something which is experimental, which is repeatable, which can be predicted, and which is falsifiable.

Of course, not everybody's willing to go out and do the experiments, but for the people who are willing to go out and do that, - if the experiments don't work, then it means it's not science.

If the facts are contrary to any predictions, then the hypothesis is wrong no matter how appealing.

Modern science is predicated on 'truths' verified through accurate observation and measurements of physical world phenomena.

I can assure you that no string theorist would be interested in working on string theory if it were somehow permanently beyond testability. That would no longer be doing science.

The true method of knowledge is experiment.

The man of science has learned to believe in justification, not by faith, but by verification.

Truth in science is always determined from observational facts.

Moreover, in the experimental sciences, the scientific fraternity must test a new theory to destruction, if possible.

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

You make observations, write theories to fit them, try experiments to disprove the theories and, if you can't, you've got something.

You can't prove any hypothesis, you can only improve or disprove it.

Science is a series of judgments, revised without ceasing.

A good scientific theory is one which is falsifiable, which has not been falsified.

Science is evidence-based and provides a continuing understanding of complex natural phenomena. Our understanding is constantly evolving and continually improving.

Every theory presented as a scientific concept is just that; it's a theory that tries to explain more about the world than previous theories have done. It is open to being challenged and to being proven incorrect.

A valid scientific theory is predictive, verifiable, and replicable. To me, that's beautiful.

Science has authority, not because of white coats, or titles, but because of precision and transparency: you explain your theory, set out your evidence, and reference the studies that support your case.

Reason, observation, and experience; the holy trinity of science.

Science means simply the aggregate of all the recipes that are always successful. All the rest is literature.

The process of science is difficult and challenging. It involves always being aware that your ideas might be right or they might be wrong. I think it's that kind of balance that makes science so interesting.