consider something one's duty

"I consider it my duty to go with you," he said.

I consider it my duty to help in any way I can.

He had married her to a duke then considered his duty done.

They also consider it their duty to take part in international peacekeeping operations.

So it was time to consider his second duty.

But I was married with a baby then, and, in 1949, this was considered my first duty.

Once the cathedral itself has been visited, a pilgrim may of course consider his duty done.

Since you consider that your duty, that's what you must do.

At this moment, I consider this goal my duty as a director.

For those reasons, I consider it my duty to abstain from voting.