The greatest virtues are those which are most useful to other persons.

Conscientious and careful physicians allocate causes of disease to natural laws, while the ablest scientists go back to medicine for their first principles.

Happiness is a certain activity of soul in conformity with perfect goodness

In revolutions the occasions may be trifling but great interest are at stake.

It is their character indeed that makes people who they are. But it is by reason of their actions that they are happy or the reverse.

Youth should be kept strangers to all that is bad, and especially to things which suggest vice or hate. When the five years have passed away, during the two following years they must look on at the pursuits which they are hereafter to learn. There are two periods of life with reference to which education has to be divided, from seven to the age of puberty, and onwards to the age of one and twenty.

For nature by the same cause, provided it remain in the same condition, always produces the same effect, so that either coming-to-be or passing-away will always result.