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There is nothing like practice.

Logic is in the eye of the logician.

In theory, there is no difference between theory and practice. But, in practice, there is.

Logic teaches rules for presentation, not thinking.

In theory there is no difference between theory and practice. In practice there is.

Practice does not make perfect. Only perfect practice makes perfect.

Logic takes care of itself; all we have to do is to look and see how it does it.

Logic must look after itself. In a certain sense, we cannot make mistakes in logic.

The mind has its own logic but does not often let others in on it.

Traditionalists often study what is taught, not what there is to create.