'Teach' in the Bible

Many peoples shall go and say, "Come, let's go up to the mountain of Yahweh, to the house of the God of Jacob; and he will teach us of his ways, and we will walk in his paths." For out of Zion the law shall go forth, and the word of Yahweh from Jerusalem.

Whom will he teach knowledge? To whom will he explain the message? Those who are weaned from the milk, and drawn from the breasts?