Titus of Bostra

But the severity of their loss led them to the Saviour; for it follows, Then they went out to see what was done, and came to Jesus; and here remark, that while God punishes men in their substance, He confers a blessing upon their souls. But when they had set out, they see him in his right mind who had been long vexed. It follows, And they found the man out of whom the devils had departed sitting at the feet of Jesus clothed, (whereas before he was naked,) and in his right mind. …

Catena Aurea by Aquinas ↗

Bede

Those who came to Jesus, and found the man from whom the demons had gone out, sitting, clothed, and in his right mind, at His feet, and they were afraid, etc. This signifies the multitude delighted with ancient sweetness, honoring indeed, but unwilling to endure the Christian law, while they say that they cannot fulfill it, yet admiring the faithful people healed from their formerly lost conduct. …

On the Gospel of Luke ↗

Bonaventure

Secondly, as regards the investigation of the truth heard, it is added: And they went out to see what was done, and they came to Jesus. They went out, I say, for inquiry; Song of Songs 3: "Go forth, daughters of Sion, and see king Solomon"; and in the Psalm: "Come and see the works of the Lord, what wonders he has placed upon the earth." They went out moreover to Jesus, who is the Truth, that they might learn the truth. …

Commentary on Luke, Chapter 8 ↗