The roots of knowledge are bitter, but its fruit are sweet.

Virtue is uniform, conformable to reason, and of unvarying consistency; nothing can be added to it that can make it more than virtue; nothing can be taken from it, and the name of virtue be left.

Thrift is of great revenue.

Friendship is not to be sought for its wages, but because its revenue consists entirely in the love which it implies.

I cheerfully quit from life as if it were an inn, not a home; for Nature has given us a hostelry in which to sojourn, not to abide.

There is in fact a true law namely right reason, which is in accordance with nature, applies to all men and is unchangeable and eternal. ... It will not lay down one rule at Rome and another at Athens, nor will it be one rule today and another tomorrow. But there will be one law eternal and unchangeable binding all times and upon all peoples.

The leaders should all relate to this principle: the governed must be as happy as possible.