Gregory the Great — on Eph 4:8-9 (Book VII, Letter 15)

“Moreover, after your departure I learned from information given me by my most beloved sons the deacons that your Love had said that our Almighty Lord and Saviour Jesus Christ, when He descended into hell, saved all who there acknowledged Him as God, and delivered them from the pains due to them. With regard to this subject I desire that your Charity should think very differently. For, when He descended into hell, He delivered through His grace those only who both believed that He should come and observed His precepts in their lives... Considering, therefore, all these things, hold nothing but what the true faith teaches through the Catholic Church: namely, that the Lord in descending into hell rescued from infernal durance those only whom while living in the flesh He preserved through His grace in faith and good conduct.”