But he was old enough to understand politics and know his duty.

I'm only a woman who knows her duty and wants to do it in peace.

This one at least knew his duty and did it.

They knew their duty, to keep the true faith of God.

He knew his duty, too; the police must be told.

"You do not think your senior officers know their duty?"

The guard, who refused to give his name, said he did not know her duties.

Lauren knew his duty and he turned back again to the tree.

They would punish him for leaving the fight, but he knew his duty.

He had the satisfaction of knowing his duty and doing it.