Charles Spurgeon Commentary 1 John 2:20

"And ye have an anointing from the Holy One, and ye know all the things." — 1 John 2:20 (ASV)

But you have an unction from the Holy One, and you know all things.

The Spirit of God will teach you as you need to know. He will so instruct you that you shall know all that is for your soul's good, and for his own glory.