Calling must be distinct from regeneration or new birth, but they are closely associated in the economy of salvation. The Sovereign and gracious work of the Spirit in regeneration enables the called one to respond in Trust. The Spirit of God after regeneration operates upon the new man's will, not forcing him, because he is now a new creation with a will bent towards God and heavenly things, whereas prior to new birth, he is opposed to these holy and heavenly things and enslaved to sin and evil continually.
Gen 6:
5 And God saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.
Folks, this is the real deal of everyone born naturally, even to this day. To deny this is pride and arrogance over the word of Truth. but also:
gen 8:
21And the LORD smelled a sweet savour; and the LORD said in his heart, I will not again curse the ground any more for man's sake; for the imagination of man's heart is evil from his youth; neither will I again smite any more every thing living, as I have done.
See, no change in mans nature after the flood.
Jer 13:
23Can the Ethiopian change his skin, or the leopard his spots? then may ye also do good, that are accustomed to do evil.
How can one Trust in the Holy Jesus that is accustomed to do evil ?
Jer 17:
9 The heart is deceitful above all things, and desperately wicked: who can know it?
Now is this the heart that Paul refers to in rom 10:
9That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
Or is Paul speaking of this heart ? ezk 36:26
A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh.
Its no doubt in my mind today, that the heart Paul is referring to in rom 10:9 is the new heart given in ezk 36:26 it is given in regeneration.
Jn 1:
5And the light shineth in darkness; and the darkness comprehended it not.
jn 3:
19And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil.
Men by nature being darkness [ eph 5:8] loveth darkness, rather than Light, for this is true of every single human being born into this world, to include the elect.
So the regenerated person is made willing, in the day of Gods power [ ps 110:3] which is the inner working of the Spirit of God !
zech 4:6
Then he answered and spake unto me, saying, This is the word of the LORD unto Zerubbabel, saying, Not by might, nor by power, but by my spirit, saith the LORD of hosts.
In todays religious world, God the Spirit is greatly dishonored, for the advancement of the damnable heresy of the freewill of man.
The Call addresses the conscious of the renewed man, those who have had their conscious purged by the blood of Christ per heb 9:
14How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?
And it is these [ those with purged conscious by the blood of Christ] that are called heb 9:
15And for this cause he is the mediator of the new testament, that by means of death, for the redemption of the transgressions that were under the first testament, they which are called might receive the promise of eternal inheritance.