Faith flows from without the man to the man by Gods grace, faith is not of ourselves says paul but it as well as and included with salvation is a gift..

Faith therefore reveals salvation consicously to the heirs of salvation , it gives them assurance , spiritual suasion to trust, to take God at His word of promise..

heb 11:

1Now faith is the (A)assurance of things (B)hoped for, the conviction of (C)things not seen.

Another scripture speaks of the assurance of faith..

1 thess 1:

5For our gospel came not unto you in word only, but also in power, and in the Holy Ghost, and in much assurance; as ye know what manner of men we were among you for your sake.

Now we know paul on the road of damascus did not have faith when he was breathing out threats and slaughters, but the power of God gave him faith and love to Jesus christ as a gift, here is his testimony..

1 tim 1:

13Who was before a blasphemer, and a persecutor, and injurious: but I obtained mercy, because I did it ignorantly in unbelief.

14And the grace of our Lord was exceeding abundant with faith and love which is in Christ Jesus.

See, faith is a gift of Gods grace to the elect, thats why its written by this same man..

eph 2:

8For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:

9Not of works, lest any man should boast.

Nothing of man all from grace..sovereign grace , we see here a illustration in pauls conversion of grace reigning supremely over sin and death, and so it is with all the election of grace..