A man does what he must - in spite of personal consequences, in spite of obstacles and dangers - and this is the basis of all human morality.
A good friend who points out mistakes and imperfections and rebukes evil is to be respected as if he reveals a secret of hidden treasure.
As every divided kingdom falls, so every mind divided between many studies confounds and saps itself.
An instructor should exemplify the things he seeks to teach. It will be of great advantage if you yourself can do all you ask of your students and more.
Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.
A system of morality which is based on relative emotional values is a mere illusion, a thoroughly vulgar conception which has nothing sound in it and nothing true.
Adapt yourself to the things among which your lot has been cast and love sincerely the fellow creatures with whom destiny has ordained that you shall live.
Be at war with your vices, at peace with your neighbors, and let every new year find you a better man.
