Have you ever told someone before, “hey, what you’re doing right now, just trust me you don’t want to keep going down that road”? Your advice is coming from a place of experience. James, the brother of Jesus, had some of that. This was a guy who the gospel writer John described as not having faith in Jesus. 

But then later in life James has a change of heart - he even becomes the leader of the church in Jerusalem. Along the way he writes a letter for Christians. He says in James 1:6 that when “you ask [God for wisdom] you must believe and not doubt, because the one who doubts is like a wave of the sea, blown and tossed by the wind.” 

What he’s saying is that to ask God for help but not believe he can give you any is no good. You’re not setting yourself up to receive wisdom. The wave analogy really drives this home because they’re moved by the wind. As a Christian this means to be affected by forces outside of yourself instead of the Spirit of God that is inside of you. So, don’t get blown around, believe God will direct you and hold fast to that.