Time steals away without any inconvenience.

There is a certain consideration, and a general duty of humanity, that binds us not only to the animals, which have life and feeling, but even to the trees and plants. We owe justice to people, and kindness and benevolence to all other creatures who may be susceptible of it. There is some intercourse between them and us, and some mutual obligation.

Tortures are a dangerous invention, and seem to be a test of endurance rather than of truth.

The most certain sign of wisdom is a continual cheerfulness; her state is like that of things in the regions above the moon, always clear and serene.

What kind of truth is this which is true on one side of a mountain and false on the other?

It is an absolute perfection and virtually divine to know how to enjoy our being rightfully.

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.