Matthew 11:27

All things are delivered up to me by my Father: and no person knoweth the Son but the Father; neither knoweth any person the Father but the Son, and he to whom the Son is pleased to reveal him.

John 17:3

and this is eternal life, that they should know thee the only true God, and him whom thou hast sent, Jesus, the Messiah.

1 John 5:20

But we know that the Son of God hath come, and hath given to us understanding, that we might know the true God; and we are in him that is true, in his Son Jesus the Messiah. HE is the true God, and the life eternal.

Treasury of Scripture Knowledge

Summary

The fear of the LORD is the beginning of wisdom: and the knowledge of the holy is understanding.

Bible References

The knowledge

Matthew 11:27
All things are delivered up to me by my Father: and no person knoweth the Son but the Father; neither knoweth any person the Father but the Son, and he to whom the Son is pleased to reveal him.
John 17:3
and this is eternal life, that they should know thee the only true God, and him whom thou hast sent, Jesus, the Messiah.
1 John 5:20
But we know that the Son of God hath come, and hath given to us understanding, that we might know the true God; and we are in him that is true, in his Son Jesus the Messiah. HE is the true God, and the life eternal.