'Lacking' in the Bible

Then Jesus looked at him and loved him, and said, "One thing is lacking in you: go, sell all you possess and give the proceeds to the poor, and you shall have riches in Heaven; and come and be a follower of mine."

Now I can find joy amid my sufferings for you, and I fill up in my own person whatever is lacking in Christ's afflictions on behalf of His Body, the Church.

while night and day, with intense earnestness, we pray that we may see your faces, and may bring to perfection whatever may be still lacking in your faith?

For the man in whom they are lacking is blind and cannot see distant objects, in that he has forgotten that he has been cleansed from his old sins.