Fathers and sons are much more considerate of one another than mothers and daughters.

Everyone thinks that the principal thing to the tree is the fruit, but in point of fact the principal thing to it is the seed.

The refinement of morality increases together with the refinement of fear. Today the fear of disagreeable feelings in other people is almost the strongest of our own disagreeable feelings.

Our salvation lies not in knowing, but in creating!

It has therewith come to be recognized that the history of moral valuations is at the same time the history of an error, the error of responsibility, which is based upon the error of the freedom of will.

What we know oman today is limited precisely by the extent to which we have regarded him as a machine.

Logic, too, also rests on assumptions that do not correspond to anything in the real world, e.g., on the assumption that there areequal things, that the same thing is identical at different points in time: but this science arose as a result of the opposite belief (that such things actually exist in the real world). And it is the same with mathematics, which would certainly never have arisen if it had been understood from the beginning that there is no such thing in nature as a perfectly straight line, a true circle, and absolute measure.