Les Liaisons dangereuses (Dangerous Liaisons) Part 2, Letters 66-70 Summary

Letter 66: The Vicomte de Valmont to the Marquise de Merteuil

Valmont shares the two previous letters with the Marquise.
He advises that, when the time comes, they make some of the letters public.
That would make it appear that Cécile was the instigator of the relationship and that her mother negligent in guarding her daughter's virtue.
He tells the Marquise that they have to be careful not to ruin the plan for Cécile's marriage to Gercourt. After all, Gercourt finding out that his wife isn't a virgin is the whole point of this scheme.

Madame de Tourvel writes to Valmont and offers her friendship, which she says is all that she can give.
If Valmont keeps talking about his love, she'll lose her confidence in him.
After all, what more could an honorable man want than the friendship of an honorable woman?

Refusing only her friendship, Valmont says he must be truthful and he again professes his love.
She should be grateful he's doing that, because it shows him to be honest.

Madame de Volanges refuses to speak to her daughter and taken away all her paper and pens so she can't write to Danceny. Like any good teenager, she sneaks some paper from an old letter and writes on that.
Cécile's not wild about using Valmont as their go-between, but she'll put up with him for the sake of her love of Danceny.

At a party, Valmont is praising the Marquise for everyone to hear.
Another partier, Prévan, expresses total disbelief in her virtue.
He plans to pursue her.
Valmont clues in the Marquise, hoping she'll agree to ruin the guy.
Regarding Tourvel, Valmont intends to make her work for his love. He thinks that her "no" means "yes."