We want you to know, brethren, about the grace of God which has been shown in the churches of Macedonia, for in a severe test of affliction, their abundance of joy and their extreme poverty have overflowed in rich generosity. For they gave according to their means, as I can testify, and beyond their means, of their own free will. Begging us earnestly for the favor of taking part in the relief of the saints. 2 Corinthians 8:1-4
“By “the grace of God” Paul…is not excluding the role of free will by saying this but teaching that every good work is made possible by the help of God.”
Theodoret of Cyr (c. 393-458) in Commentary on the Second Epistle to the Corinthians, 327. PG 82:422. ACCS1.2C.266.