It’s there, Lucky7. You just don’t see it in the body of the document, but it can be found in the footnotes. These explain the basis from which the Council Fathers formulated this document, and point to traditional teachings. Thus, there is continuity. If we truly trusted that these many bishops did their homework when they met in their sessions to discern what the Holy Spirit would have them write, then the document would be sufficient for us at its face value. But for those who hold doubts or wish to do further study, I offer the root of their statement in LG-16.
Footnote (18) Cfr. S. Thomas, Summa Theol. III, q. 8, a. 3, ad 1.*
Objection 1.
It would seem that Christ is not the Head of all men. For the head has no relation except to the members of its body. Now the unbaptized are nowise members of the Church which is the body of Christ., as it is written (
Ephesians 1:23). Therefore Christ is not the Head of all men.
Reply to Objection 1. Those who are unbaptized, though not actually in the Church, are in the Church
potentially. And this potentiality is rooted in two things–first and principally, in the power of Christ, which is sufficient for the salvation of the whole human race; secondly, in free-will…
(From Lg-16) Nor does Divine Providence deny the helps necessary for salvation to those who, without blame on their part, have not yet arrived at an explicit knowledge of God and with His grace strive to live a good life. Whatever good or truth is found amongst them is looked upon by the Church as a preparation for the Gospel. (20*)
Footnote (20)
Reply to
Objection 1. The sacraments of the New Law do seem to contain grace. For
Report. 4 d.1 q.3 n.1] the Church seems expressly to signify this in one of its collects saying, “Let the sacraments, O Lord, perfect in us what they contain;” but that which, from the sacraments, is perfective of the soul which receives them is grace; therefore they contain this very thing, that is to say, grace.**
Therefore, just as those who attribute to the sacraments a real causality say that the
character or the ornament in the soul is a per se disposition to grace,
Oxon. ib. q.5 n.17] so I say that the sacrament or its reception is a per se proximate** disposition to grace, and for this reason it could rightly be defined by the saints and doctors with respect to this end or effect.
Baptism, therefore, being a sacrament, does provide God’s unremitting grace to strive to do His will. The soul receives continual “actual” graces flowing from the sacrament. If the soul cooperates with these to the best of one’s conscience, it may attain salvation. This would apply to those of other faiths who have been lawfully baptized.
There are several scriptures outside of Chapter II, that also help shed light on this passage, from #125-129. Might be good to read in your studies.