"Nature has sown into the hearts of all men the seeds of self-love."

"The greatest part of our happiness depends on our dispositions, not on our circumstances."

"Nature has given to men one tongue, but two ears, that we may hear from others twice as much as we speak."

"The most dangerous of all flattery is that of a man's self to himself."

"The mind is not a vessel to be filled, but a fire to be kindled."