There is no such things as initial grace or initial salvation
Grace is grace and we are either saved or we are not saved
Grace in any sense is the opposite of works
Paul said grace plus works equals works.
Grace plus anything (including baptism) equals works
salvation is a long process
that's your issue or stumbling block
Redemption :
The redemption was accomplished by Christ with no participation on our part. All mankind is redeemed.
Lk 2:11 Jn 1:29 rm 5:8 eph 2:1-8 1 pet 1:21-23
God gives all men sufficient truth and grace for salvation.
Justification:
then if we accept His redemption we are justified, born again by faith and baptism. Mk 16:16 Jn 3:5 acts 2:38 8:36 Titus 3:5 1 pet 3:21
Sanctification:
Members of Christ and his church by grace we practice good works (prayer, alms, fasting, virtues charity, suffering other sacraments etc. until death. Phil 1:29
Purification
Glorification
Salvation:
Is for those who are faithful and die in the grace of God united to Christ and in his saints at death enter into eternal salvation! Mk 13:13 Matt 24:13
Titus 2:14
Who gave himself for us, that he might redeem us from all iniquity, (redemption) and purify unto himself a peculiar people, (justification / baptism notice purify / wash) Jn 3:5 zealous of good works. (Sanctification) Jn 15:4 abide in Christ Matt 3:16 believes (present tense) Matt 24:13 endures to the end Shall be saved.
(Salvation)
Glorification:
Suffering required for glorification with Christ!
Romans 8:17
And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together.
2 Timothy 2:12
If we suffer, we shall also reign with him: if we deny him, he also will deny us:
Justification and salvation are not the same rom 5:9 Much more then, being now justified by his blood, we shall be saved from wrath through him.
we don't receive one grace or even one kind of grace
there are three kinds of grace:
the initial grace of justification
sanctifying grace
actual grace
the scripture is replete with references to increasing grace, to gaining more and new graces daily
every greeting of the fathers include the phrase: grace be unto you!
maybe you have noticed it?
example:
1 thes 1:1 Paul, and Silvanus, and Timotheus, unto the church of the Thessalonians which is in God the Father and in the Lord Jesus Christ: Grace be unto you, and peace, from God our Father, and the Lord Jesus Christ.
or
1 pet 2:2 Elect according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ: Grace unto you, and peace, be multiplied.
thks