The study of books is a drowsy and feeble exercise which does not warm you up.

What kind of truth is it which has these mountains as its boundary and is a lie beyond them?

Nor is it enough to toughen up his soul; you must also toughen up his muscles.

A tutor should not be continually thundering instruction into the ears of his pupil, as if he were pouring it through a funnel, but, after having put the lad, like a young horse, on a trot, before him, to observe his paces, and see what he is able to perform, should, according to the extent of his capacity, induce him to taste, to distinguish, and to find out things for himself; sometimes opening the way, at other times leaving it for him to open; and by abating or increasing his own pace, accommodate his precepts to the capacity of his pupil.

Fame and tranquility can never be bedfellows.

It is indeed the boundary of life, beyond which we are not to pass; which the law of nature has pitched for a limit not to be exceeded.

Cowardice is the mother of cruelty.