Einstein's results again turned the tables and now very few philosophers or scientists still think that scientific knowledge is, or can be, proven knowledge.

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.

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

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

The people inside the gym didn’t stand a dead drunk’s chance.

Telling lies is a bit like tiling bathrooms - if you don't know how to do it properly, it's best not to try.

I realise few people get to live the life they always wanted, but I'm so neurotic, I don't really think about it. I'm too busy thinking, 'I hope I don't screw up my next scene.

We're going to rebuild our military. Our military is depleted. Our military is frankly, our military is in trouble.

I'd love to talk to Joaquin Phoenix because he's a very private guy. Also, he's creating a new kind of sexy leading man. To me, his face is new and might be legendary someday.

As the visit of one we love makes the whole day pleasant, so is it illumined and made fair by a brave and beautiful thought.

When I was 17, I was hyperactive and annoyed my teachers.

One of the things I've done personally is bring my girlfriends into my health and fitness journeys.

Entrepreneurs are the forgotten heroes of America.

How often I failed in my duty to God, because I was not leaning on the strong pillar of prayer.