To be content with what we possess is the greatest and most secure of riches.
The nobler a man, the harder it is for him to suspect inferiority in others.
Judge not by the number, but by the weight.
You may never be less alone than when you are alone.
It is not enough to acquire wisdom, it is necessary to employ it.
What is morally wrong can never be advantageous, even when it enables you to make some gain that you believe to be to your advantage. The mere act of believing that some wrongful course of action constitutes an advantage is pernicious.