Thomas Aquinas

Next is set forth the division as to position: and he shall set the sheep on his right hand, but the goats on his left. What is understood by the right hand, and what by the left? It can be said that literally it will be so, that the good will be placed on one side and the wicked on the other. Or because the right side is the nobler, therefore those who are good will have the nobler position, because they will meet Christ in the air. …

Commentary on Matthew ↗