Because Jesus Christ is sufficient, we do not have to be guilty or anxious for not doing enough good in our own lives.
This principle is summarized in Hebrews 9:14. "How much more will the blood of Christ, who through the eternal Spirit offered Himself without blemish to God, purify our conscience from dead works to serve the living God."
Without blemish: means Christ was a perfect, sufficient sacrifice
Purify our conscience: means we must no longer suffer anxiety or guilt about our insufficiency
Dead works: means the stuff we do to try to be sufficient, but it never works.
Serve the Living God: means we do everything to worship and thank God, not to try to be perfect or sufficient on our own.