One new age like of thinking is promoting the belief in self. This is like the "Do what you want" new agism style beliefs that do not align with the Gospel message. Prosperity gospel. If you do this you get this.... OK. We do have sowing and reeping in the scriptures, but if you plough in a crop for the purposes of self, the crop will fail as it does not come under Gods blessing, hence there is a difference between the prosperity gospel and Gods mighty provision, and the sowing and reeping.
I'm not against prosperity as who are we to covert whom God has blessed and what God does in one persons life could be very different to what God does in another persons life. For example, God may bless one person so he or she will be accepted by high society so God can work through this person to reach the lost. I know one very humble gentleman who has his own aircraft whom God has blessed so he can reach remote places with the gospel. It took him weeks to get there before between car and on foot. God Himself blessed the man so he could do this. The aircraft is a tool to reach the people who need access to His Word.