He says the same thing will happen again to a dead certainty, and that the more evidence he has the surer he'll be of the decree.

I think he's afraid Van Torp has some explanation up his sleeve that will swing things the other way.' 'Didn't he catch her here ?' asked the elder man, evidently annoyed.
'Didn't he find the money on this table in an envelope addressed to her?
Didn't he have two witnesses with him?
Or is all that an invention ?' 'It happened just so.

But he's afraid there's some explanation--' 'Feist,' said Isidore Bamberger slowly, 'find out what explanation the man's afraid of, pretty quick, or I'll get somebody who will.

It's my belief that he's just a common coward, who takes money from his wife and doesn't care how she gets it.

I suppose she refused to pay one day, so he strengthened his position by catching her; but he doesn't want to divorce the goose that lays the golden egg as long as he's short of cash.