We are caught up in a paradox, one which might be called the paradox of conceptualization. The proper concepts are needed to formulate a good theory, but we need a good theory to arrive at the proper concepts.

Experience is of particulars only.

Every discipline develops standards of professional competence to which its workers are subject... Every scientific community is a society in the small, so to speak, with its own agencies of social control.

The price of training is always a certain trained incapacity: the more we know how to do something, the harder it is to learn to do it differently.

We are caught up in a paradox, one which might be called the paradox of conceptualization. The proper concepts are needed to formulate a good theory, but we need a good theory to arrive at the proper concepts.

We are forever asking Nature whether it has stopped beating its wife.

Mathematics is not yet capable of coping with the naïveté of the mathematician himself.