It is only in times of great and grievous dullness that the believer regards prayer as a duty, and not as a privilege.

To promote knowledge is thus an inescapable duty imposed on every one of the friends of God.

The position of the U.N. ... must be strengthened so that it can perform its duty of safeguarding peace in a more effective way,

It is the duty of the writer to describe.

The notion of obligations comes before that of rights, which is subordinate and relative to the former. A right is not effectual by itself, but only in relation to the obligation to which it corresponds ...

The ranch has a duty to make sure its hillside stays on its property.

And that, my friends, is the duty of the church.

knowledge of our duties is the most useful part of philosophy.

The whole duty of a conductor is comprised in his ability to indicate the right tempo.

Oh, duty is what one expects from others, it is not what one does oneself.