Jealousy is a sin, but we have all felt that feeling from time to time. God is the only one who is truly holy and he is the one who will bring to our attention the sin in our hearts. It can get frustrating to see others getting blessed when your situation is staying the same, but trust God. You have to keep your heart pure and ask God to remove the jealousy. Besides, we are God's representative here on earth. Comparison breeds jealousy, so it is best to learn to be satisfied with what you have. Bring everything to the feet of Jesus.