And, mind you, there are plenty of people in the world who aren't blackguards.
There's my brother, for instance.

He's a bit of a prig--in fact, he's as priggish as he well can be--but he's never done anything but run straight.

I don't suppose he could go crooked if he tried.' Hyacinth got up.
'Good-night,' he said, 'and good-bye.

I shan't go with you.' 'Wait a minute,' said Captain Quinn.

'I think I've done you one good turn to-night in stopping you going to South Africa.