Does God promise to supply all my need, and what counts as need?

Verse 19 is not a general principle floating free of the letter. It follows a thank-you for a gift, sent by a church Paul elsewhere describes as giving out of deep poverty, 2 Corinthians 8:1 to 5. They had reduced their own margin to support him, and Paul answers the risk they took with a promise about God's supply.

That does not make the promise smaller. It makes it precise. Generosity in Scripture is never described as financially reckless, because the God who receives the offering has undertaken to supply the giver.

Paul has already shown in verses 11 and 12 that he has known hunger as a Christian, so verse 19 cannot mean that a believer will never lack. The letter itself rules that reading out.

What then is supplied? All your need, according to His riches in glory. The measure is His wealth, not the size of the request, and the channel is by Christ Jesus. Read alongside Romans 8:32, the logic is that a God who gave His Son will not withhold what His people actually require, though He reserves the right to define the requirement.

Do not use it to guarantee an outcome you have chosen. Paul, holding this same promise, was hungry at times, verse 12, and in 2 Corinthians 11:27 he speaks of hunger, thirst and cold. Scripture does not hide that.

Do use it where Paul uses it: as the reason a Christian can give away what he might have kept. The Philippians sent to Paul more than once, verse 16, and Paul's answer is that their account is not empty because their God is rich.

The language of verse 18, an odour of a sweet smell, a sacrifice acceptable, comes from the offerings described in Leviticus 1:9 and Leviticus 2:2, where the offering's smoke is a sweet savour to the LORD. Paul is deliberately treating a financial gift as an offering brought to God rather than a payment made to a man.

Epaphroditus, named in verse 18, carried the gift, and Philippians 2:25 to 30 records that he nearly died in that service. Scripture provides both details itself.