Lloyd-Jones' point and the one I am trying to make here is that if we don't comprehend the depth of our sin and are always comparing ourselves with others who are 'worse sinners,' we won't see the glory of Christ's sacrifice for sin. Compare yourself with God's standard. You must love God with all of your heart, soul, mind, and strength and your neighbor as yourself. Have you? Sure, I've never murdered someone, but I have been full of self-righteous pride. My sin is ugly. It's only when we truly feel this that we will experience the joy that comes from resting in Christ. Lloyd-Jones says, "If you have never realized your guilt or guiltiness before God you will never have joy in Christ. It is impossible. 'Not the righteous, sinners Jesus came to save.' 'They that are whole have no need of a physician, but they that are sick.'"
It may be counter-intuitive to think that contemplating our sin will lead to greater joy, but if we skip this part, we'll miss the true joy Christ affords all who find refuge in him. Only then we will see the greatness of the Savior who died to forgive all of those sins. If you are in Christ, you are forgiven and free and therein is true joy. So make sure you see the depth of you sin, but don't stay there. Move quickly to the cross and find the joy that comes from deliverance through Christ our Savior!