John 14:26:

But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and being all things to your remembrance, whatsoever I have said unto you.

See also:

Who You Are and What You Have
Jesus, the Best Faith Teacher
God’s Mercy and Compassion
How to Be Baptized with the Holy Spirit
What Does God Think About Taking Vitamins, Immune System Enhancers, Diet Aids, and So On?
What Can I Do to Make God’s Written Word Become “Rhema” to Me?
Objection: God Uses Sickness to Teach You Things
Objection: The Lord Puts Us on Our Backs That He May Teach Us to Look Up