" Christians who are no longer sure that God loves and accepts them in Jesus, apart from their present spiritual achievements, are subconsciously radically insecure persons, much less secure than non-Christians, because of the constant bulletins they receive from their Christian environment about the holiness of God and the righteousness they are supposed to have. Their insecurity shows itself in pride, a fierce defensive assertion of their own righteousness and defensive criticism of others. They cling desperately to legal, pharisaical righteousness, but envy [and] jealousy and other … sin grow out of their fundamental insecurity.” (Dynamics of Spiritual Life, pages 211-212) "
― Timothy J. Keller , Galatians for You (God's Word for You)