Great Expectations

On page 120 Burroughs talked about coming to worship with great expectations of a merciful God. It contrasts our relationships because people get upset with us for asking to much, however God is pleased the more we ask of Him. He also pointed out that we need to come with merciful hearts to a merciful God. I was thinking about that because I tend to have a very judgmental spirit, how can I ask for God's mercy when I'm not willing to give it?