'Instruct' in the Bible

Who is he trying to teach?Who is he trying to instruct?Infants just weaned from milk?Babies removed from the breast?

For his God doth instruct him to discretion, and doth teach him.

With whom did he consult to enlighten and instruct him on the path of justice? Or who taught him knowledge and showed him the way of wisdom?

This is what the Lord,the Holy One of Israel and its Maker, says:“Ask Me what is to happen to My sons,and instruct Me about the work of My hands.

He shall see of the fruit of the travail of his soul, and shall be satisfied: by his knowledge shall my righteous servant instruct many in righteousness; and he shall bear their iniquities.