I'm not sure that is easy to do. I understand that you are friends and it's not easy to tell your friend something that he may not like hearing. BTW, you are a good friend, that you are trying to help.

Maybe you could tell him that you had a dream and someone told you the solution to his problem? That way he would hear you out, but it would not be coming straight from you (at least, that's how he would see it).

But being a good friend, maybe you could sit him down and tell him straight up what you feel.