The knees - The mission of Paul and Barnabas Acts 13:1-4 is another marked epoch in the Church's history; and the time of Paul's martyrdom denotes an increase in the Gentile Church, which corresponds with the waters reaching the loins.

And again he measured a thousand, and brought me through the waters; the waters were to the knees,.... The man with his line measured another thousand cubits straight on from the first; and then bid the prophet cross and ford them again, and then they were knee deep:

again he measured a thousand, and brought me through; the waters were to the loins; a third time he measured a thousand cubits still onward, and ordered the prophet to wade through them, when they were risen so high as to reach his loins. The waters to the knees and loins may signify the greater knowledge of the Gospel, and the mysteries of it, the apostles had after the Spirit was poured forth; and the greater spread of it in the world, among Jews and Gentiles: or else may design those doctrines of the Gospel, and mysteries of grace, which are more sublime, and more difficult to understand; which require some pains to search into, and get the knowledge of; as concerning predestination, election, the covenant of grace, and the eternal transactions between the Father and the Son, &c. which are meat for strong men, who have their senses exercised to discern between good and evil.

Again he measured a thousand, and brought me through the waters; the waters were to the knees. Again he measured a thousand, and brought me through; the waters were to the loins.

47:1-23 These waters signify the gospel of Christ, which went forth from Jerusalem, and spread into the countries about; also the gifts and powers of the Holy Ghost which accompanied it, by virtue of which is spread far, and produced blessed effects. Christ is the Temple; and he is the Door; from him the living waters flow, out of his pierced side. They are increasing waters. Observe the progress of the gospel in the world, and the process of the work of grace in the heart; attend the motions of the blessed Spirit under Divine guidance. If we search into the things of God, we find some things plain and easy to be understood, as the waters that were but to the ankles; others more difficult, which require a deeper search, as the waters to the knees, or the loins; and some quite beyond our reach, which we cannot penetrate; but must, as St. Paul did, adore the depth, Ro 11. It is wisdom to begin with that which is most easy, before we proceed to that which is dark and hard to be understood. The promises of the sacred word, and the privileges of believers, as shed abroad in their souls by the quickening Spirit, abound where the gospel is preached; they nourish and delight the souls of men; they never fade nor wither, nor are exhausted. Even the leaves serve as medicines to the soul: the warnings and reproofs of the word, though less pleasant than Divine consolations, tend to heal the diseases of the soul. All who believe in Christ, and are united to him by his sanctifying Spirit, will share the privileges of Israelites. There is room in the church, and in heaven, for all who seek the blessings of that new covenant of which Christ is Mediator.