Augustine of Hippo

"The saints shall exult in glory" [Psalm 149:5]. I would say somewhat important about the glory of the saints. For there is no one who loves not glory. But the glory of fools, popular glory as it is called, has snares to deceive, so that a man, influenced by the praises of vain men, shall be willing to live in such fashion as to be spoken of by men, whosoever they be, in whatsoever way. …

Exposition on Psalm 149 ↗

Jerome

The saints shall exult in glory. In what glory? "Arise, my glory; arise, psaltery and lyre: I will arise at dawn." In glory. "For the Spirit was not yet given, because Jesus was not yet glorified" — that is, he had not yet been crucified. Scripture says this, The Spirit was not yet given, because Jesus had not been glorified, that is, he had not been crucified. The saints shall exult in glory. Why do I say all this? Because it is said, The saints shall exult in glory. This, then, is what I say: the saints shall exult in the cross. …

Homily 59, on Psalm 149 ↗

Gregory the Dialogist

Hence it is said by the Psalmist of the just, "The Saints shall be joyful in glory, they shall rejoice upon their beds"; in that when they flee the mischiefs from things without, they exult in safety within the recesses of their hearts. But the joy of the heart will then be complete, when the fight of the flesh shall have ceased without. For so long as the flesh allures, because as it were the wall of our house is shaken, even the very bed is disturbed.

Morals On The Book Of Job 8:24.41 ↗