But wouldn't you agree that we shall never have any idea who the Father has given the faith to? With that said, shouldn't we as believers assume that if someone confesses Jesus as Lord, we should assume they have the capacity to become a disciple?
Yes. Having the capacity "hearing the words of eternal life" and applying them .Is the work of two . We can plant and water the incorruptible seed but the father must cause the growth if any. Like those in Hebrew 6 . They heard and shared but because the Father was no drawing them they fell away in un-belief (no faith) Many disciples walked away never to follow again.
If he begins the good work of salvation in us he promises he will finish it. (Philippians 1:6) We keep our eye on him with a open heart to our brothers and sisters . I think we could say mix faith looking up the eternal and walking forward the temporal. As sons of God we are not what we will be.
Make it the goal to be of the Twelve.
And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father. From that time many of his disciples went back, and walked no more with him. Then said Jesus unto the twelve, Will ye also go away?John 6: 65-67