Whereof I was made a minister, according to the gift of the grace of God given unto me by the effectual working of his power.
Whereof - `of which' Gospel.
According to - in consequence of, and in accordance with, "the gift of the grace of God."
Given - `which (gift of grace) was given to me, according to х kata (G2596), as Ephesians 3:20; Ephesians 1:19: as the result of, and in proportion to] the effectual working (Greek, 'energy,' or 'in-working') of His power.' Omnipotence alone could convert the persecutor into the 'minister.'