Donald Johanson Quotes

The theory of evolution, like the theory of gravity, is a scientific fact.

Evolution is a theory, and it's a theory that you can test. We've tested evolution in many ways. You can't present good evidence that says evolution is not a fact.

Nothing in biology makes sense except in the light of evolution.

The creationists repeatedly assert that evolution is a theory, and, indeed, not a scientific theory at all because it is unable to predict future developments. Both statements are untrue. Evolution [phenomenon] is a fact, not theory. It once was a theory but today, as a consequence of observation and testing it is probably the best authenticated actu- ality known to science. There are theories concerning the mechanisms of evolution but no competent student doubts the reality of evolution

Evolution is among the most well-established theories in the scientific community. To doubt it sounds to biologists as absurd as denying relativity does to physicists.

Evolution is a bankrupt speculative philosophy, not a scientific fact.

Evolution, as such, is no longer a theory for a modern author. It is as much a fact as that the earth revolves around the sun.

Is evolution a theory, a system, or an hypothesis? It is much more: it is a general condition to which all theories, all hypotheses, all systems must bow and which they must satisfy henceforward if they are to be thinkable and true.

Evolution is a light illuminating all facts, a curve that all lines must follow.

[Evolution is] one of the best documented, most compelling and exciting concepts in all of science.

Evolution is the fundamental idea in all of life science - in all of biology.

We know evolution happened because innumerable bits of data from myriad fields of science conjoin to paint a rich portrait of life's pilgrimage.

There is no controversy within science over the core proposition of evolutionary theory.

Evolution has long been the target of illogical arguments that use presumption.

Evolution is one of the two or three most primally fascinating subjects in all the sciences.

Evolution thus is merely contingent on certain processes articulated by Darwin: variation and selection.

The proof of evolution lies in those adaptations that arise from improbable foundations.

Spencer's god was Evolution, sometimes also called Progress.

And, you know, the fact is, if you believe in evolution, we all have a common ancestor, and we all have a common ancestry with the plant in the lobby. This is what evolution tells us. And, it's true. It's kind of unbelievable.

You can't even begin to understand biology, you can't understand life, unless you understand what it's all there for, how it arose - and that means evolution.

I have at least, as I hope, done good service in aiding to overthrow the dogma of separate creations.

The Theory of Evolution has been proved true

The Theory of Evolution has had over a million chances to be wrong, but never has been.

Evolution is as much a fact as the heat of the sun.

...evolution is not a religious tenet, to which one swears allegiance or belief as a matter of faith.. It is a factual reality of the empirical world. Just as one would not say 'I believe in gravity," one should not proclaim 'I believe in evolution.