Cyrill of Alexandria
He then spoke directly to the captives, encouraging them with hopeful words, saying, "Sit ye in the stronghold of the bound hosts." By "stronghold," he refers to the church, which is fortified in Christ and stands firm and unwavering; and by "sitting," he signifies steadfastness in faith, as it is said of God, "that thou sittest forever" (Psalm 28:10), meaning that His nature is both unchangeable and unshakeable. Thus, he assures the prisoners of my hosts that they will be safe, grounded in their faith. This reflects the holy assembly of the justified in Christ. He alludes to their perseverance in pursuing greatness and their unwavering love for God, assuring them that this will not go unrewarded, stating, "And for one day of thy coming I will richly reward thee." What does this imply?
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The pilgrims on earth are all saints, and the physical existence of every individual is fleeting, so insignificant that it can be compared to just a single day. Thus, he indicates that for one day of your arrival, meaning the short and transient span of earthly life, I will bestow great and abundant rewards. Moreover, Christ also proclaimed, "A measure of good things, pressed down, shaken together, and running over, will be given into your bosom" (Luke 6:38). While we anticipate rewards that reflect our deeds, they will be given in abundant measure, for the Giver is exceedingly generous.