5. Not by--Greek, "Out of"; "not as a result springing from works," &c.
      of righteousness--Greek, "in righteousness," that is, wrought "in a state of righteousness": as "deeds . . . wrought in God." There was an utter absence in us of the element ("righteousness") in which alone righteous works could be done, and so necessarily an absence of the works. "We neither did works of righteousness, nor were saved in consequence of them; but His goodness did the whole" [THEOPHYLACT].
      we--emphatically opposed to "His."
      mercy--the prompting cause of our salvation individually: "In pursuance of His mercy." His kindness and love to man were manifested in redemption once for all wrought by Him for mankind generally; His mercy is the prompting cause for our individual realization of it. Faith is presupposed as the instrument of our being "saved"; our being so, then, is spoken of as an accomplished fact. Faith is not mentioned, but only God's part. as Paul's object here is not to describe man's new state, but the saving agency of God in bringing about that state, independent of all merit on the man's part (see on Tit 3:4).
      by--Greek, "through"; by means of.
      the washing--rather, "the laver," that is, the baptismal font.
      of regeneration--designed to be the visible instrument of regeneration. "The apostles are wont to draw an argument from the sacraments to prove the thing therein signified, because it ought to be a recognized principle among the godly, that God does not mark us with empty signs, but by His power inwardly makes good what He demonstrates by the outward sign. Wherefore baptism is congruously and truly called the laver of regeneration. We must connect the sign and thing signified, so as not to make the sign empty and ineffectual; and yet not, for the sake of honoring the sign, to detract from the Holy Spirit what is peculiarly His" [CALVIN], (1Pe 3:21). Adult candidates for baptism are presupposed to have had repentance and faith (for Paul often assumes in faith and charity that those addressed are what they profess to be, though in fact some of them were not so, 1Co 6:11), in which case baptism would be the visible "laver or regeneration" to them, "faith being thereby confirmed, and grace increased, by virtue of prayer to God" [Article XXVII, Church of England]. Infants are charitably presumed to have received a grace in connection with their Christian descent, in answer to the believing prayers of their parents or guardians presenting them for baptism, which grace is visibly sealed and increased by baptism, "the laver of regeneration." They are presumed to be then regenerated, until years of developed consciousness prove whether they have been actually so or not. "Born of (from) water and (no 'of' in Greek) the Spirit." The Word is the remote and anterior instrument of the new birth; Baptism, the proximate instrument. The Word, the instrument to the individual; Baptism, in relation to the Society of Christians. The laver of cleansing stood outside the door of the tabernacle, wherein the priest had to wash before entering the Holy Place; so we must wash in the laver of regeneration before we can enter the Church, whose members are "a royal priesthood." "Baptism by the Spirit" (whereof water baptism is the designed accompanying seal) makes the difference between Christian baptism and that of John. As Paul presupposes the outward Church is the visible community of the redeemed, so he speaks of baptism on the supposition that it answers to its idea; that all that is inward belonging to its completeness accompanied the outward. Hence he here asserts of outward baptism whatever is involved in the believing appropriation of the divine facts which it symbolizes, whatever is realized when baptism fully corresponds to its original design. So Ga 3:27; language holding good only of those in whom the inward living communion and outward baptism coalesce. "Saved us" applies fully to those truly regenerate alone; in a general sense it may include many who, though put within reach of salvation, shall not finally be saved. "Regeneration" occurs only once more in New Testament, Mt 19:28, that is, the new birth of the heaven and earth at Christ's second coming to renew all material things, the human body included, when the creature, now travailing in labor-throes to the birth, shall be delivered from the bondage of corruption into the glorious liberty of the children of God. Regeneration, which now begins in the believer's soul, shall then be extended to his body, and thence to all creation.
      and renewing--not "the laver ('washing') of renewing," but "and BY the renewing," &c., following "saved us." To make "renewing of the Holy Ghost" follow "the laver" would destroy the balance of the clauses of the sentence, and would make baptism the seal, not only of regeneration, but also of the subsequent process of progressive sanctification ("renewing of the Holy Ghost"). Regeneration is a thing once for all done; renewing is a process daily proceeding. As "the washing," or "laver," is connected with "regeneration," so the "renewing of the Holy Ghost" is connected with "shed on us abundantly" (Tit 3:6).

JFB.