Gregory the Dialogist

MORAL INTERPRETATION. The small and great are there; the servant is free from his master. Forasmuch as there is to us in this life a difference in works, doubtless there will be in the future life a difference in degrees of dignity, that whereas here one surpasses another in desert, there one may excel another in reward. Hence Truth says in the Gospel, In My Father's house are many mansions. But in those 'many mansions,' the very diversity of rewards will be in some measure in harmony. …

Morals on the Book of Job, Book IV ↗

Thomas Aquinas

He shows this is true by adding, "The small and the great are there," on an equal basis because smallness and greatness are reckoned in this life according to the inequality of earthly prosperity, when this is taken away they return to their natural equality. Therefore "the small and the great" should be interpreted to mean those who were different in this life because of the magnitude of earthly prosperity. Yet note that the difference between small and great in spiritual goods remains even there. …

Commentary on Job ↗