That had saved him from falling lower than a certain dimly defined level.

If there was a spark of good in him he owed it to her.

He had never sunk so low as in that intolerable moment when he had doubted her.

For the behavior of the brute is low enough in all conscience; but below that is the behavior of the cad.

Tyson had his own curious code of morals.
Yes; and in the raw enthusiasm of remorse he had made all manner of vows and promises, and he felt bound in honor to keep them.