Matthew 11:27

All things are given me by my Father; and no one knows the Son but the Father; and no one knows the Father but the Son, and he to whom the Son will reveal him.

John 17:3

And this is the eternal life; that they shall know thee, the only true God, and Jesus Christ whom thou hast sent.

1 John 5:20

And we know that the Son of God has come, and has given us understanding that we may know the true One; and we are in the true One, in his Son Jesus Christ; this is the true God, and eternal life.

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 given me by my Father; and no one knows the Son but the Father; and no one knows the Father but the Son, and he to whom the Son will reveal him.
John 17:3
And this is the eternal life; that they shall know thee, the only true God, and Jesus Christ whom thou hast sent.
1 John 5:20
And we know that the Son of God has come, and has given us understanding that we may know the true One; and we are in the true One, in his Son Jesus Christ; this is the true God, and eternal life.