'Lacking' in the Bible

I am glad of the coming of Stephanas and Fortunatus and Achaicus: for that which was lacking on your part they have supplied.

And when I was present with you, and wanted, I was chargeable to no man: for that which was lacking to me the brethren which came from Macedonia supplied: and in all things I have kept myself from being burdensome unto you, and so will I keep myself.

Night and day praying exceedingly that we might see your face, and might perfect that which is lacking in your faith?