"Two hundred thousand."
Serge tells Marc how much he's paid for the all white painting. This fact shocks, Marc who can't believe this is considered in any way, shape, or form art and that his friend could have such "terrible" taste.
"I find these colors touching. Yes. If it's all the same to you. Stop wanting to control everything."
Yvan says this in front of both Marc and Serge. Serge cannot believe he's said such a thing because to him there are no colors to be touched by. White is not a color to Serge: it is a tone and the painting is a mockery of art to him, and he fights anyone who says otherwise.
"Cancel the wedding."
Serge has come out and told Yvan to cancel his upcoming wedding. The irony of his statement is that Serge hasn't had a successful marriage and yet he's giving advice on relationships to his friend. Moreover, Serge is emotionally overwhelmed by Marc's hatred of the painting he's had to purchase; his need to defend it and cut everything else down, including Yvan's marriage, is in full effect here.
