"They're all such fo-oo-ools!" "You don't think that of all men, do you!" "Why not ?" laughed Helen again, and tucking the letters into her waist she started humming.

Unobserved Ma'm Maynard had entered to straighten the room and, through the mirror, Mary saw her grimly nodding her head.
"Why, Ma'm Maynard," said Mary, "you don't think that all men are fools, too, do you ?" "Eet is not halways safe to say what one believes," said Ma'm, pursing her lips with mystery.

"Eef mademoiselles, your aunts, should get to hear--" "Oh, I won't tell." "Then, yes, ma cherie, I think at times all men are fools ...

and I think it is also good at times to make a fool of man.

For why?
Because it is revenge.
"Ah, ma cherie, I who have been three times wed--I tell you I often think the old-world view is right.