Final recompense was a divine judicial function. Jesus' saying is particularly notable because the Son of Man comes with angels and personally renders to each person according to his deeds.
Matthew later expands this claim in the judgment of the nations, where the Son of Man sits on his glorious throne and separates all humanity.
Psalm 62:12 addresses the Lord and says that he renders to a person according to his work. Proverbs 24:12 similarly asks whether the one who weighs the heart will not repay each according to his work.
Jesus' saying uses this established divine-judgment language for the coming Son of Man.
Immediately after teaching that disciples must take up the cross and follow him, Jesus grounds the seriousness of discipleship in his future coming.
The Son of Man will come in the glory of his Father with his angels and will then repay every person according to what he has done. Jesus thus places himself at the center of final accountability.
The saying is strong cumulative evidence because it assigns Jesus a function repeatedly attributed to God: universal judgment according to deeds.
The phrase 'his Father's glory' preserves distinction and can be understood as bestowed glory, so the passage should not be isolated as a direct assertion of ontological deity. Matthew 25:31-46 later makes the judicial role even more explicit.