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. SproulWhat better evidence could there be of a man's salvation than that he offers to others the grace he himself has received?
R. C. SproulThe glory of the gospel is this: The one from whom we need to be saved is the one who has saved us.
R. C. Sproul