Cosmas Indicopleustes

I shall no longer behold the salvation of God upon the earth. The salvation of God here signifies Christ; for thus also Symeon, when he took up Christ in his arms, prayed God to be allowed to depart from this life, since his eyes had seen the salvation of God, namely Christ himself for it had been revealed to him by the Spirit that he should not see death, until he had seen the Lord Christ. …

The Christian Topography, Book 8 ↗

Jerome

I said, I shall not see the Lord God in the land of the living: I shall behold man no more, nor the inhabitant of rest. My generation has ceased: it has been taken away and rolled up from me like a shepherd's tent. My life has been cut off as by a weaver: while I was still beginning, it cut me off. I said, I shall not see the Lord God in the land of the living. …

Commentary on Isaiah ↗

Thomas Aquinas

Second, he laments the loss of good things, as to the vision of God: I sought, from the Lord, that he might supply, the residue, taken away from me, or I sought in myself how much life remained for me. I said, to myself: I shall not see the Lord God, still only through a likeness, in the land of the living, in heavenly beatitude: I believe to see the good things of the Lord in the land of the living (Ps 27:13); or I shall not see the Lord God, any more, seeing the temple and the worship of the Lord, in the land of the living, namely, …

Commentary on Isaiah ↗