When I consider the wonderful activity of the mind, so great a memory of what is past, and such a capacity of penetrating into the future: when I behold such a number of arts and sciences, and such a multitude of discoveries hence arising,--I believe and am firmly persuaded that a nature which contains so many things within itself cannot be mortal.

He who acknowledges a kindness has it still, and he who has a grateful sense of it has requited it.

It is a great proof of talents to be able to recall the mind from the senses, and to separate thought from habit.

No obligation to do the impossible is binding.

Death is not natural for a state as it is for a human being, for whom death is not only necessary, but frequently even desirable.

The face is a picture of the mind with the eyes as its interpreter.

To be content with what we possess is the greatest and most secure of riches.