Duty is the essence of morality.

Duty, honor, country. Those three hallowed words reverently dictate what you ought to be, what you can be, what you will be.

Duty is the echo of God's command, sounding through the corridors of time and eternity.

The first duty of a human being is to assume the right functional relationship to society - more briefly, to find your real job, and do it.

Duty is the great business of a sea officer; all private considerations must give way to it, however painful it may be.

Duty is the essence of manhood.

No duty is more urgent than that of returning thanks.

The first duty of society is justice.

Do your duty, and leave the rest to Providence.

The duty of every citizen is to question authority.

Do your duty, and leave the rest to heaven.

No man has a right to do what he pleases, except when he pleases to do right.

The duty of youth is to challenge corruption.

Duty is the stern daughter of the voice of God.

We are all born ignorant, but one must work hard to remain stupid.

The first duty of a man is the seeking after and the investigation of truth.

The first duty of love is to listen.

Duty makes us do things well, but love makes us do them beautifully.