Our knowledge can only be finite while our ignorance must necessarily be infinite.

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

The growth of knowledge depends entirely upon disagreement.

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.

Forgiveness is always hard, but we must always try to leave room for reasonable attempts at reconciliation to occur.

Being nice is state of "Probability", not a state of "possibility".

Remember your dreams and fight for them. You must know what you want from life. There is just one thing that makes your dream become impossible: the fear of failure.

No future historian of the United States will be able to use quotations from her twentieth-century poets in support of an imperial policy of conquest and slaughter.

Be careful what you set your heart upon - for it will surely be yours.

Men must be either the slaves of duty, or the slaves of force.

Where the Government is weak, military sway prevails.

This clay, so strong of heart, of sense so fine,Surely such clay is more than half divine--'Tis only fools speak evil of the clay,The very stars are made of clay like mine.

It is a dangerous thing to be satisfied with ourselves.

There's no such thing as writer's block. That was invented by people in California who couldn't write.