The growth of knowledge depends entirely upon disagreement.

True ignorance is not the absence of knowledge, but the refusal to acquire it.

In so far as a scientific statement speaks about reality, it must be falsifiable; and in so far as it is not falsifiable, it does not speak about reality.

The question is not how to get good people to rule; THE QUESTION IS: HOW TO STOP THE POWERFUL from doing as much damage as they can to us.

If you can't say it simply and clearly, keep quiet, and keep working on it till you can.

The best thing that can happen to a human being us to find a problem, to fall in love with that problem, and to live trying to solve that problem, unless another problem even more lovable appears.

Ignorance is not a simple lack of knowledge but an active aversion to knowledge, the refusal to know, issuing from cowardice, pride, or laziness of mind.

A theory which is not refutable by any conceivable event is non-scientific. Irrefutability is not a virtue of a theory (as people often think) but a vice.

I may be wrong and you may be right, and by an effort, we may get nearer to the truth

The attempt to make heaven on earth invariably produces hell.

Evolution is not a fact. Evolution doesn't even qualify as a theory or as a hypothesis. It is a metaphysical research program, and it is not really testable science.

The greatest achievement is self awareness.

Illiterate people should only be charged for the photographs

It's the job, I think, of leaders to try to address peoples' real legitimate concerns and channel them in the most constructive ways possible.

We were never designed to receive glory. We were designed to give glory.

If you take advantage of everything that America has to offer, there's nothing you can't accomplish.

My experience with horses is that they never throw away a chance to go lame.

Writing should be the settlement of dew on the leaf.

Sometimes, we just don't know enough about what we are trying to achieve.

It is better to be small, colorful, sexy, careless, and peaceful.

What a wonderful contribution our grandmothers and grandfathers can make if they will share some of the rich experiences and their testimonies with their children and grandchildren.