a lack: something still missing from a required or expected whole, a shortfall waiting to be made up
This is an ordinary, everyday word for a shortfall, the gap between what should be there and what actually is. In common Greek it named an unpaid balance on a bill or an empty spot in the pantry, a countable deficit. It carries no built-in religious weight of its own; it simply points to something that is missing from a total that ought to be complete.
Paul does something striking with this plain word. Again and again he pairs it with a verb meaning "to fill up," turning "shortfall" into a picture of how the people of God supply one another. What one person or church is short of, another makes up out of their surplus: money for the poor, a friend's presence in place of an absent congregation, teaching that was left unfinished. Every shortfall is treated as a gap that someone else is meant to close.
Because the core idea is so steady, the different uses are shades of one meaning rather than separate meanings. The context tells you what kind of gap is in view (empty pockets, a missed visit, an unfinished lesson), but in each case the word means the same thing: what is still lacking and needs to be supplied. Its single most debated appearance, in Colossians 1:24, belongs to this same family of "a gap that gets filled," even though what exactly is lacking there has been argued over for centuries.
Nuances
What is "lacking" in the afflictions of Christ that Paul fills up in his own body, and in what sense.
- contestedThe messianic woes: a fixed measure of end-time tribulation must be endured before the close of the age, and Paul absorbs an outsized share of that predetermined quota, sparing his fellow believers. The definite article and the intensive verb suggest a bounded, quantifiable amount.; Eduard Lohse, Colossians and Philemon (Hermeneia, 1971); James D. G. Dunn, The Epistles to the Colossians and to Philemon (NIGTC, 1996); Peter T. O'Brien, Colossians, Philemon (WBC 44, 1982); Richard Bauckham, 'Colossians 1:24 Again: The Apocalyptic Motif,' EvQ 47 (1975): 168-70
- contestedApostolic mission: what is lacking is not more suffering but the personal, physical carrying of Christ's already-finished work to peoples who have not yet heard it. Paul bears in his own body the ministry of the exalted Christ, who no longer suffers in person. This reading has become ascendant since about 2008.; Jacob Kremer, Was an den Leiden Christi noch mangelt (Bonn: Hanstein, 1956); Douglas J. Moo, The Letters to the Colossians and to Philemon (Pillar, 2008); Scot McKnight, The Letter to the Colossians (NICNT, 2018); G. K. Beale, Colossians and Philemon (BECNT, 2019)
- minorityMystical union: the sufferings belong to Christ because his body the church suffers, and Paul, as one member, bears his share of what Christ still endures in his people. The oldest reading, retained in Catholic and some Reformed traditions.; John Calvin, Commentary on Colossians; Roy Yates, 'A Note on Colossians 1:24,' EvQ 42 (1970): 88-92