We want you to know, brothers, about the grace of God that has been given among the churches of Macedonia,  for in a severe test of affliction, their abundance of joy and their extreme poverty have overflowed in a wealth of generosity on their part.  For they gave according to their means, as I can testify, and beyond their means, of their own accord,  begging us earnestly for the favor of taking part in the relief of the saints— and this, not as we expected, but they gave themselves first to the Lord and then by the will of God to us.  Accordingly, we urged Titus that as he had started, so he should complete among you this act of grace.  But as you excel in everything—in faith, in speech, in knowledge, in all earnestness, and in our love for you—see that you excel in this act of grace also.
 I say this not as a command, but to prove by the earnestness of others that your love also is genuine.  For you know the grace of our Lord Jesus Christ, that though he was rich, yet for your sake he became poor, so that you by his poverty might become rich.  And in this matter I give my judgment: this benefits you, who a year ago started not only to do this work but also to desire to do it.  So now finish doing it as well, so that your readiness in desiring it may be matched by your completing it out of what you have.  For if the readiness is there, it is acceptable according to what a person has, not according to what he does not have.  For I do not mean that others should be eased and you burdened, but that as a matter of fairness  your abundance at the present time should supply their need, so that their abundance may supply your need, that there may be fairness.  As it is written, “Whoever gathered much had nothing left over, and whoever gathered little had no lack.”
–2 Corinthians 8:1-15 (ESV)
Now concerning the collection for the saints: as I directed the churches of Galatia, so you also are to do.  On the first day of every week, each of you is to put something aside and store it up, as he may prosper, so that there will be no collecting when I come.  And when I arrive, I will send those whom you accredit by letter to carry your gift to Jerusalem.  If it seems advisable that I should go also, they will accompany me.
– 1 Corinthians 16:1-4 (ESV)
Such is the grace of giving. It is not dictated by ability. It has nothing to do with being well off. It views giving as a privilege. It is willing. It is joyfully enthusiastic.
– Philip Hughes