Does philosophy actually ever help anyone?

I live in shared accommodation and it's ok I guess except there's this one guy who's a some kind of hippy type (I mean he smokes weed a lot not that he has long hair or wears tie dye) listens to strange music, never ever goes out and reads and reads philosophy books all the time.

I have tried telling him that he doesn't need philosophy of he lets Jesus into his heart and I think deep down he sneers at me for saying that (except he's too polite to make this obvious).

So is philosophy any good? Has it ever actually improved anyones life ?