This it the Lord’s wonderful picture of discretion. You must be so discreet that it is almost as if one part of your body does not know what another part is doing.
Any sober consideration of what we are must take into account all that we do, both good and bad. The sin that is in us is straightforwardly our own. We must confess it daily and repent of it with renewed prayer to avoid it. The good is relative good only. To be truly good it must come from a right motive, must be according to a right standard, and must have a right goal. We fail in all three respects, even when we can say we have done something good. Furthermore, we remember what we were, and we attribute all that is acceptable within us to the Lord who gave us a new nature at the new birth. Without faith, a gift from above, we cannot please God.