Jerome

"What has been was already named, and it is known that he is but a man. He cannot contend with one who is mightier than him." Clearly this is predicting the arrival of the Saviour, since he writes 'he will be'; before he was seen in body his name was already written in the Scriptures and was known by prophets and holy men of God, since he was a man; and similar to this, since he is a man, he is not able to walk with his Father. And in the Gospel it says: "the Father, who sent me, is greater than me." [Ioh. …

Commentary on Ecclesiastes ↗

Bonaventure

And indeed he forbids to scrutinize this, consequently saying: "He who is to be" etc. Here he calls back from scrutinizing hidden things, such as the divine disposition: on account of which he says: "He who is to be, his name has already been called," with respect to eternal election; Romans 4: "Who calls those things which are not, as though they were." "And it is known that he is man," with respect to the smallness of the duration of life: Genesis 3: "Dust you are, and to dust you shall return." "And he cannot contend in judgment …

Commentary on Ecclesiastes, Chapter 6 ↗