"He wouldn't do a goddamn thing to you. He'd simply talk to you, and you'd talk to him, for God's sake. For one thing, he'd help you realize the patterns of your mind."
The patterns of Holden's mind are laced with longing for times past. He calls up "old Luce", his student advisor from Whooton, just so he can have a drink and talk with him...even though he claims he doesn't care much for Luce to begin with. When Luce shows up, Holden sinks back into a person we don't recognize - he jokes about sex, flits, and other immature things. Who is this Holden? This isn't who we know and identify with. This can't be Holden Caufield...can it?
It can.
This is Holden trying to relate to Luce. This is Holden trying to make himself the same person he was back in the day. This is Holden trying to convince himself that life can stay frozen in a moment and that things can stay the way they are. This is Holden trying not to grow up.
But when Holden changes himself this way, he's in for a big surprise. Old Luce shoots him down, showering him with insults and not responding to his conversation starters. Luce has moved on; he's grown up and matured, and he's isn't the person he was before.
When Luce leaves, Holden is shocked; he's confused; he's hurt. He doesn't understand that things have changed; people have changed; that everything has changed. He doesn't understand because he doesn't want to; he doesn't try to. The patterns of his mind have convinced him that it's simple to slip back into the good old days; that with a phone call and a friend, you can be who you were before; that nostalgia can become reality again.
The patterns of all of our minds tell us things can be the same - that things don't have to change. We convince ourselves that of course, we're still the same people, and that the world doesn't spin madly on. If we looked past these patterns, though, we'd see that everyday, we're all changing. None of us are who were before, and life will stop for nobody. We're all growing up, and there's nothing any of us can do about it.
Life is a game, and the patterns of our minds only make losing hurt that much worse.