William Burkitt on 1 Timothy 3:12

That is, "Let not any such be admitted deacon who has more wives than one, or that hath injuriously put away one, and married to another; and let them show by the good government of their own children and household, that they are fit to govern the church of God."

Note here, That the higher officers of the church were usually chosen out of the inferior; and accordingly, the qualifications for both offices, namely, that of bishops and deacons, are for the greatest part the same, both in this epistle and in that to Titus.