George Leo Haydock

Seeing [1] it is a just thing. Literally, If yet it be just. St. Chrysostom takes notice, that we must not expound the text as if St. Paul made a doubt whether it was just or not for God to repay retribution to such as troubled, afflicted, and persecuted his faithful servants, and to punish them when he shall be revealed (i.e. at the day of judgment) with flaming fire, or with the flames of hell: nothing certainly is more just; as on the contrary, it is just to reward the pious and those who are found worthy of the glorious kingdom of God. (Witham)