A problem cannot be solved at the level of consciousness in which it occurs.

We owe a lot to the Indians, who taught us how to count, without which no worthwhile scientific discovery could have been made.

Highly developed spirits often encounter resistance from mediocre minds.

Understanding of our fellow human beings...becomes fruitful only when it is sustained by sympathetic feelings in joy and sorrow.

Compound interest on debt was the banker's greatest invention, to capture, and enslave, a productive society.

Democracy, taken in its narrower, purely political, sense, suffers from the fact that those in economic and political power possess the means for molding public opinion to serve their own class interests. The democratic form of government in itself does not automatically solve problems; it offers, however, a useful framework for their solution. Everything depends ultimately on the political and moral qualities of the citizenry.

We come now to the question: what is a priori certain or necessary, respectively in geometry (doctrine of space) or its foundations? Formerly we thought everything; nowadays we think nothing. Already the distance-concept is logically arbitrary; there need be no things that correspond to it, even approximately.