Fire.

"Every great move of God can be traced back to one man on his knees." (-famous dead guy) Sorry I used to do a lot of high-school small groups. You' d be suprised how much longer you can keep a teens attention by dropin names without actually dropin a name. How do you know that it's from God? How do you know when your passionate about something... and that something is a passion that God put there? I can't tell you how God may speak to you. If we were really listening, I'm not sure that we could count all of the ways he speaks to us. What I can tell you is that passion is a fire. Have you ever started a fire? There are a lot of ways, but usually it done by getting on your knees and lighting something that burns easily...but needs continual feeding. When a passion (fire) in your life is truely from God it will have started on your knees. If your passion (fire) isn't from God, it will eventually burn out...and there's no telling what else it may take with it.