Do you love God for selfish reasons and then try harder to be sincere because you know you ought to be?
It seems like most people know that deep down their reasons for loving and worshipping God are selfish reasons, and so they feel guilty because they know that they should be sincere about it. So then they try really hard to be sincere, but then it turns out the only reason they are TRYING to be sincere is again, for selfish reasons. So they are stuck right back where they started, in a selfish place. Where are you when it comes to your love for God, do you struggle with this (unsolvable) problem?