God Himself supplies the necessary condition to come to Jesus, that's why it is 'sola gratia,' by grace alone, that we are saved.
R. C. SproulThe grand difference between a human being and a Supreme being is precisely this: Apart from God I cannot exist; apart from me God does exist. God does not need me in order for Him to be. I do need God in order for me to be. We are dependent. We are fragile. This is how we differ from God.
R. C. SproulWe break our promises to one another. We break our promises to God. But God never breaks His promises to us.
R. C. Sproul