Augustine of Hippo — as excerpted in the Catena Aurea on John 21:1-11

“(Tract. cxxii) In the draught before, the number of the fishes is not mentioned, as if in fulfilment of the prophecy in the Psalm, If I should declare them, and speak of them, they should be more than I am able to express; (Ps. 41:7) but here there is a certain number mentioned, which we must explain. The number which signifies the law is ten, from the ten Commandments. But when to the law is joined grace, to the letter spirit, the number seven is brought in, that being the number which represents the Holy Spirit, to Whom sanctification properly belongs. For sanctification was first heard of in the law, with respect to the seventh day; and Isaiah praises the Holy Spirit for His sevenfold work and office. The seven of the Spirit added to the ten of the law make seventeen; and the numbers from one up to seventeen when added together, make a hundred and fifty-three.”