BJ Penn website source:

This fight is the cherry on the sundae. He wants to fight me so he can then retire. I would like to fight him too, but after I fight him and win the fight, what happens next? These days, yeah, there’s a lot of money to be made, but I don’t fight for the money. My motivation is to be the best. Like we said, to be the Wayne Gretzky of my sport. So if I fight him, what happens next? It will be over. So yes, I want the fight, but I want to take it when I decide the time is right, not when he wants the fight to happen.

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 GSP Wants The Silva Fight, But Only On His Terms When The Time Is Right | UFC NEWS