He who has conferred a benefit on anyone from motives of love or honor will feel pain, if he sees that the benefit is received without gratitude.
Learning is not child's play; we cannot learn without pain.
No tyrant need fear till men begin to feel confident in each other.
... the science we are after is not about mathematicals either none of them, you see, is separable.
It is better for a city to be governed by a good man than by good laws.
Happiness is prosperity combined with virtue.