SCRIPTURE COMMENTARY #383
" I must work the works of him that sent me, whilst it is day: the night cometh, when no man can work. As long as I am in the world, I am the light of the world." When he had said these things, he spat on the ground and made clay of the spittle and spread the clay upon his eyes, And said to him: "Go, wash in the pool of Siloe," which is interpreted, "Sent." He went therefore and washed: and he came seeing. (John 9:4-7)
EFFECTS OF HOLY BAPTISM: The pool of Siloe, by washing in which the blind man received his sight, was a type of Baptism, by the washing of which those who are born spiritually blind through original sin, receive their sight, and the light of faith. Whence Baptism used to be called the Sacrament of "illumination."
[From 'A Practical Commentary on Holy Scripture' by Bishop Knecht, D.D.]
(1899 Douay-Rheims Bible)