OldRegular,
Simple to confound the wise.
God said from Genesis to Revelation, that Salvation is THROUGH FAITH! meaning that faith is the Condition of man, whereby man is saved. The MEANS (the one who performs salvation) IS God! The Time of God's Salvation is while God's grace toward man is present! Thus we are saved by GOD in His grace, THROUGH our FAITH! Salvation is the Gift of God. Salvation, unlike Grace, Faith, Mercy, Justice, etc, is that which God does give to man in a form that can be recieved, and is truly a gift that man can receive.
In Ephesians 2:8 The Gift of God is SALVATION! In Johh 3:16 The gift of God, to those who believe in HIS son, is SALVATION! Abraham's Faith was counted to him as Righteousness and it is only the righteous who are Saved by God throughout the OT! FAITH in the Old Testament is the SAME as FAITH in the New Testament! It is the condition of the human spirit! The human spirit which has "the knowledge of good and evil" is "Born Again", by hearing the word of God and believing. The change in old nature and new nature is manifest in the deeds and demeanor of the one who is so changed, and that change comes out of Knowledge. God said, "For lack of knowledge, my people perish".
The Gift of God is His Son, "the living Word", who taught certain men whom we know as the apostles, given by The Father to the Son, John 17, and the gift included the Teachings of the Apostles given to us in writing.
Purchase Salvation? Are You out of your mind? You cannot purchase that which is given, the giver does not accept "exchange" for his Gift of Salvation, else it is NOT A GIFT! But instead is a commodity of exchange. Salvation is the unilateral gift of God given by Him to those who are wearing pink shirts, Not blue, or green or any other color, just pink! Pink is the color of our shirt that draws God's attention to us and makes him want to give us his gift of SALVATION.
"Pink shirt" in the above paragraph represents FAITH. We may well have to "purchase" faith through our effort to gain the Knowledge that keeps us from Perishing. Bible study is a work, but the faith gained by bible study is not a work it is the payoff of doing the work. Listening to boring preachers may well be a work too! Doing the things that reinforce our "faith" are works too, but the faith is not a work, it is the reward for doing those things that are works. The works that we do, allow us to purchase the pink shirt, which worn and kept spotless is what God sees in us for which he gives us the Gift of Salvation!