Cyril of Alexandria

For this is the way of the envious man, he feeds in himself his pang of grief with the praises of others. But the Lord knew all things, and searches the hearts; as it follows, But he knew their thoughts, and said to the man who had the withered hand, Rise up, and stand. And he arose, and stood forth, that perchance he might stir up the cruel Pharisees to pity, and allay the flames of their passion.

Catena Aurea by Aquinas ↗

Augustine of Hippo

But it may be questioned how Matthew came to say, that they asked the Lord, whether it was lawful to heal on the sabbath, when Luke in this place states that they rather were asked of the Lord. We must therefore believe that they first asked the Lord, and that then He understanding by their thoughts that they sought an opportunity to accuse Him, placed the man in the midst whom He was going to heal, and asked the question which Mark and Luke relate Him to have asked. …

Catena Aurea by Aquinas ↗

Bede

He himself knew their thoughts, etc. This is what we read: The Lord knows the thoughts of men, that they are vain (Psalm XCIII). And what follows: Blessed is the man whom you instruct, Lord, and teach him out of your law (Ibid.). This is said about those who have learned that the law fulfilled through Christ, not to be a carnal commandment for us, but a spiritual Sabbath.

On the Gospel of Luke ↗

Bonaventure

But he himself knew their thoughts. After the opportunity of the miraculous work, there is added here the sublimity of the wondrous worker with respect to three things, namely with respect to the wisdom of discerning in the heart, the prudence of questioning in speech, and the efficacy of healing in deed. …

Commentary on Luke, Chapter 6 ↗