It seems quite clear to me; even usin g 400 year old language...
Ephesians 2:8-9 (King James Version)
For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
Not of works, lest any man should boast.
While one may argue over faith being a substance, or argue that as every good gift is from God, faith is one of common grace, but as regards salvation, faith is a gift of the grace “that bringeth salvation,” (Titus 2:11), as “God hath dealt to every man the measure of faith,” (Rm. 12:3) “to them that have obtained like precious faith with us through the righteousness of God and our Saviour Jesus Christ, “ (2 Peter 1:1) “To another faith by the same Spirit.” (1 Cor. 12:9) While the latter refers to a special charism beyond saving faith, the point is that faith is given by God. And even to be able to place confidence in the mercy of God in Christ, for Him to save the damned and destitute sinner by His blood, is by grace, versus something morally earned.
Man is “dead in trespasses and sins,” and repentance is granted, enabling them to believe, (Acts 11:18) for God draws men (Jn. 6:44; 12:32) and opens their heart, (Acts 16:14) enabling them to believe and confess Christ, for no man can say that Jesus is the Lord, but by the Holy Ghost. (1Cor. 12:3b) “For unto you it is given in the behalf of Christ, not only to believe on him, but also to suffer for his sake; “ (Philippians 1:29)
“No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day. “ (John 6:44)
“When they heard these things, they held their peace, and glorified God, saying, Then hath God also to the Gentiles granted repentance unto life.” (Acts 11:18)
“And a certain woman named Lydia, a seller of purple, of the city of Thyatira, which worshipped God, heard us: whose heart the Lord opened, that she attended unto the things which were spoken of Paul. “ (Acts 16:14)
“{2} And that we may be delivered from unreasonable and wicked men: for all men have not faith. “ (2 Thessalonians 3:2)
However, i cannot yet give assent to the teaching that it is regeneration that opens the heart and enables faith, as while i see this being a work of saving grace by the Holy Spirit, i see the washing and actual indwelling of the Holy Spirit resulting from the faith which is counted for righteousness, as per Acts 2:38; Eph. 1:13. Acts 15:8,9 would favor the Calvinist position if it were chronological, but i think that may be arguable, and maybe God, which knows hearts, purified it first and the gave the Holy Spirit. (cf. 1Cor. 6:11)
Yet all of the above is one conversion event, though conversions such as Daniel Brainard testify of the degree of preparation that can take place, and how spiritual one might (apparently) before conversion. http://www.jesus.org.uk/vault/library/brainerd_diary.pdf (p. 14) Glory to God.