Augustine of Hippo

"You have sold Your people for no price" [Psalm 44:12]. For we see whom You have made over; what You have received, we have not seen. "And there was no multitude in their jubilees." For when the Christians were flying before the pursuit of enemies, who were idolaters, were there then held any congregations and "jubilees" to the honour of God? Were those Hymns chanted in concert from the Churches of God, that are wont to be sung in concert in time of peace, and to be sounded in a sweet accord of the brotherhood in the ears of God?

Exposition on Psalm 44 ↗

Thomas Aquinas

As to the fifth he says, "You have sold your people for no price," because the martyrs were killed for no price, that is, no great price. In this it is shown that they were held as worthless. Is. 52: "You were sold for nothing, and there was no great number in exchange for them." Jerome has, "You did not profit." A usurer gives little and receives much; as if to say: not many profited there, because few were converted at that time; hence more died than were converted. …

Exposition on the Psalms of David ↗