The future is always present, as a promise, a lure and a temptation.

Psychologism is, I believe, correct only in so far as it insists upon what may be called 'methodological individualism' as opposed to 'methodological collectivism'; it rightly insists that the 'behaviour' and the 'actions' of collectives, such as states or social groups, must be reduced to the behaviour and to the actions of human individuals. But the belief that the choice of such an individualist method implies the choice of a psychological method is mistaken.

A theory that explains everything, explains nothing

It is part of my thesis that all our knowledge grows only through the correcting of our mistakes.

We never know what we are talking about.

We are social creatures to the inmost centre of our being. The notion that one can begin anything at all from scratch, free from the past, or unindebted to others, could not conceivably be more wrong.

The quest for precision is analogous to the quest for certainty and both - precision and certainty are impossible to attain.