Our duty is to be useful, not according to our desires, but according to our powers.
All great things are simple, and many can be expressed in single words freedom, justice, honor, duty, mercy, hope.
To persevere in one's duty, and be silent is the best answer to calumny.
Happiness and moral duty are inseparably connected.
We have now sunk to a depth at which restatement of the obvious is the first duty of intelligent men.
Infinite striving to be the best is man’s duty; it is its own reward. Everything else is in god’s hands.
Rights that do not flow from duty well performed are not worth having.
Fear is not a lasting teacher of duty.
Love is a better teacher than duty.
We only know of one duty, and that is to love.