John 9:7

The fountain of Siloe was at the foot of the walls of Jerusalem, to the east, where its waters were collected in a reservoir for the benefit of the city. Thither our Saviour sent the blind man. The word Siloe signifies sent, and was a figure of Christ, who was sent by his eternal Father into the world to enlighten all men, of whom this blind man was the emblem. The pool of Siloe represents the sacrament of baptism, by which we are sanctified and made Christians. It is still to this day held in great veneration by the Turks, who think its waters very beneficial in diseases of the eyes. (Calmet) — Its waters signify those of divine grace and light, communicated to the faithful soul through Jesus Christ, who was sent of God. (Bible de Vence) — Thus Sedulius:

3. The directions given to the patient, v. 7. His physician said to him, Go, wash in the pool of Siloam. Not that this washing was needful to effect the cure; but, (1.) Christ would hereby try his obedience, and whether he would with an implicit faith obey the orders of one he was so much a stranger to. (2.) He would likewise try how he stood affected to the tradition of the elders, which taught, and perhaps had taught him (for many that are blind are very knowing), that it was not lawful to wash the eyes, no not with spittle medicinally, on the sabbath day, much less to go to a pool of water to wash them. (3.) He would hereby represent the method of spiritual healing, in which, though the effect is owing purely to his power and grace, there is duty to be done by us. Go, search the scriptures, attend upon the ministry, converse with the wise; this is like washing in the pool of Siloam. Promised graces must be expected in the way of instituted ordinances. The waters of baptism were to those who had been trained up in darkness like the pool of Siloam, in which they might not only wash and be clean, but wash, and have their eyes opened. Hence they that were baptized are said to be photisthentes—enlightened; and the ancients called baptism photismos—illumination. Concerning the pool of Siloam observe, [1.] That it was supplied with water from mount Zion, so that these were the waters of the sanctuary (Ps 46 4), living waters, which were healing, Ezek 47 9. [2.] That the waters of Siloam had of old signified the throne and kingdom of the house of David, pointing at the Messiah (Isa 8 6), and the Jews who refused the waters of Shiloah, Christ's doctrine and law, and rejoiced in the tradition of the elders. Christ would try this man, whether he would cleave to the waters of Siloam or no. [3.] The evangelist takes notice of the signification of the name, its being interpreted sent. Christ is often called the sent of God, the Messenger of the covenant (Mal 3 1); so that when Christ sent him to the pool of Siloam he did in effect send him to himself; for Christ is all in all to the healing of souls. Christ as a prophet directs us to himself as a priest. Go, wash in the fountain opened, a fountain of life, not a pool.

Verses 1-7 Christ cured many who were blind by disease or accident; here he cured one born blind. Thus he showed his power to help in the most desperate cases, and the work of his grace upon the souls of sinners, which gives sight to those blind by nature. This poor man could not see Christ, but Christ saw him. And if we know or apprehend anything of Christ, it is because we were first known of him. Christ says of uncommon calamities, that they are not always to be looked on as special punishments of sin; sometimes they are for the glory of God, and to manifest his works. Our life is our day, in which it concerns us to do the work of the day. We must be busy, and not waste day-time; it will be time to rest when our day is done, for it is but a day. The approach of death should quicken us to improve all our opportunities of doing and getting good. What good we have an opportunity to do, we should do quickly. And he that will never do a good work till there is nothing to be objected against, will leave many a good work for ever undone, ( Ecclesiastes 11:4 ) . Christ magnified his power, in making a blind man to see, doing that which one would think more likely to make a seeing man blind. Human reason cannot judge of the Lord's methods; he uses means and instruments that men despise. Those that would be healed by Christ must be ruled by him. He came back from the pool wondering and wondered at; he came seeing. This represents the benefits in attending on ordinances of Christ's appointment; souls go weak, and come away strengthened; go doubting, and come away satisfied; go mourning, and come away rejoicing; go blind, and come away seeing.