7 For it is written in the prophets, “And they shall all be taught of God.” Why have I said this, O Jews? The Father has not taught you; how can you know me? For all the men of that kingdom shall be taught of God, not learn from men. And though they do learn from men, yet what they understand is given them within, flashes within, is revealed within. What do men that proclaim tidings from without? What am I doing even now while I speak? I am pouring a clatter of words into your ears. What is that that I say or that I speak, unless He that is within reveal it? Without is the planter of the tree, within is the tree's Creator. He that plants and He that waters work from without: this is what we do. But “neither he that plants is anything, nor he that waters; but God that gives the increase.” That is, “they shall be all taught of God.” All who? “Every one who has heard and learned of the Father comes unto me.” See how the Father draws: He delights by teaching, not by imposing a necessity. Behold how He draws: “They shall be all taught of God.” This is God's drawing. “Every man that has heard, and has learned of the Father, comes unto me.” This is God's drawing.
Source: Tractates on the Gospel of John (New Advent)