Theophylact of Ohrid

But the Gentiles, an alien people, acknowledged the One who cleansed them and glorified Him by faith — that God is so loving of mankind and so powerful that for our sake He took upon Himself the utmost dishonor, which is a work of love for mankind, and having taken it upon Himself, suffered no harm in His own nature, which is a work of power.

Commentary on Luke ↗

Bede

And he is commanded to rise and walk, because he who, knowing his own weakness, lies lowly on the ground, is led to advance by the consolation of the divine word to mighty deeds. But if faith made him whole, who hurried himself back to give thanks, therefore does unbelief destroy those who have neglected to give glory to God for mercies received. Wherefore that we ought to increase our faith by humility, as it is declared in the former parable, so in this is it exemplified in the actions themselves.

Catena Aurea by Aquinas ↗

Bonaventure

Third, as regards the approbation of gratitude, he adds: And he said to him: Rise, go, for your faith has made you whole. Rise, through penitence: Ephesians 5: "Rise, you who sleep, and arise from the dead"; and Acts 12: "He roused him, saying: Rise quickly." Go, through justice: Matthew 8: "I say to this one: Go, and he goes," namely through obedience, which is the noblest part of justice, which was preeminently in Christ, according to that of Matthew 26: "The Son of man indeed goes, as it is written of him," that is, to go from God …

Commentary on Luke, Chapter 17 ↗