In degenerating programmes, however, theories are fabricated only in order to accommodate known facts

Research programmes, besides their negative heuristic, are also characterized by their positive heuristic.

The positive heuristic of the programme saves the scientist from becoming confused by the ocean of anomalies.

Blind commitment to a theory is not an intellectual virtue: it is an intellectual crime.

No experimental result can ever kill a theory: any theory can be saved from counterinstances either by some auxiliary hypothesis or by a suitable reinterpretation of its terms.

Intellectual honesty consists in stating the precise conditions under which one will give up one's belief.

The proving power of the intellect or the senses was questioned by the skeptics more than two thousand years ago; but they were browbeaten into confusion by the glory of Newtonian physics.

Philosophy of science without history of science is empty; history of science without philosophy of science is blind.

There is no falsification before the emergence of a better theory.

Belief may be a regrettably unavoidable biological weakness to be kept under the control of criticism: but commitment is for Popper an outright crime.

Indeed, this epistemological theory of the relation between theory and experiment differs sharply from the epistemological theory of naive falsificationism.

I didn't know how to hold my lips.

I travel around the world, and there are so many beautiful girls, but that's not going to make you a supermodel. You have to have something more than just a pretty face.

I'm as good as I can be right now, i don't see anything that I need to really change or do differently. I'm on top of my game.

Can a man of perception respect himself at all?

Whatever is reasonable is true, and whatever is true is reasonable

The way up and the way down are one and the same.

Jesus, Mary and Joseph, I was going to squirt tears. How unprofessional.

I don't know how many [South Africans] with HIV would want to take anti-retrovirals.

Poetry depends on being simultaneously opaque and transparent. It can't be only one or the other. The pebble and the pool.

If Bush, as I believe, has reliable information on the fact that Saddam Hussein is making weapons of mass destruction, I cannot not support the policies of his government.