Augustine of Hippo

But how shall we come thither? "Happy is the man whose strength is in Thee"(ver. 5). He knew where he was, and that by reason of the frailty of his flesh he could not fly to that state of blessedness: he thought upon his own burden, as it is said elsewhere; "For the corruptible body weighs down the soul, and the earthly house depresses the understanding which has many thoughts." The Spirit calls upward, the weight of the flesh calls back again downward: between the double effort to raise and to weigh down, a kind of struggle ensues: …

On the Psalms, Psalm 84 ↗

Jerome

Blessed is the man whose help is from you. We indeed desire your tabernacles and courts and house: but this very thing, that we may be able to attain it, is not of our own strength, but of your help. He has arranged ascents in his heart. Who has arranged ascents in his heart? Blessed is the man whose help is from the Lord: he has arranged ascents in his heart. Whoever is holy is daily stretched out toward the things before, and forgets the things that are past. …

Homily 16, on Psalm 83 ↗

Bonaventure

Blessed is the man whose help is from You; he has disposed ascents in his heart, in the valley of tears, in the place which he has appointed. Since blessedness is nothing other than the enjoyment of the highest good, and the highest good is above us, no one can be made blessed unless he ascends above himself, not by a bodily ascent, but by one of the heart. But we cannot be raised above ourselves except by a higher power lifting us up. …

Itinerarium Mentis in Deum, Chapter 1 ↗