Before beginning, plan carefully.

The proof of a well-trained mind is that it rejoices in which is good and grieves at the opposite.

In a discussion of this kind our interest should be centered not on the weight of the authority but on the weight of the argument. Indeed the authority of those who set out to teach is often an impediment to those who wish to learn. They cease to use their own judgment and regard as gospel whatever is put forward by their chosen teacher.

Nothing stands out so conspicuously, or remains so firmly fixed in the memory, as something which you have blundered.

Nothing is so strongly fortified that it cannot be taken by money.

Sweet is the memory of past troubles.

All literature, all philosophical treatises, all the voices of antiquity are full of examples for imitation, which would all lie unseen in darkness without the light of literature.