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We coin concepts and we use them to analyse and explain nature and society. But we seem to forget, midway, that these concepts are our own constructs and start equating them with reality.

Hence it happens that one takes words for concepts, and concepts for the things themselves.

Things are still in early stages, but one can imagine that as we build up and systematize our theories of these associations, and try to boil them down to their core, the result might point us toward the sort of fundamental principles I advocate.

When we use terms we get confused, yet we have no other way.

It's human desire to be understood. And we always feel we're not understood.

I tend to think in images and feelings rather than non-abstract concepts.

When man becomes reconciled to nature, when space becomes his true background, these words and concepts will have lost their meaning, and we will no longer have to use them.

The analysis of concepts is for the understanding nothing more than what the magnifying glass is for sight.

Sometimes a concept is baffling not because it is profound but because it is wrong.

Fundamental progress has to do with the reinterpretation of basic ideas.