Understanding the Sufficiency of Jesus' Sacrifice

Realizing one's identity in the light of God's greatness and acceptance as a child of the Most High King squashes pride. The idea that one needs to add personal efforts to Jesus' sacrifice implies that Jesus' sacrifice was insufficient. Righteousness through personal deeds would render Christ's sacrifice purposeless, as Jesus prayed in the garden before his crucifixion, questioning if there was another way besides his sacrifice.