John 1 v14-18 explains how Jesus is the mediator between God and man, through Him we receive grace, truth and knowledge of God.

John 1:14–18

14 And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son¹ from the Father, full of grace and truth. 15 (John bore witness about him, and cried out, “This was he of whom I said, ‘He who comes after me ranks before me, because he was before me.’”) 16 For from his fullness we have all received, grace upon grace.² 17 For the law was given through Moses; grace and truth came through Jesus Christ. 18 No one has ever seen God; God the only Son, who³ is at the Father’s side,⁴ he has made him known.

Footnotes

[1] 1:14 Or only One, or unique One
[2] 1:16 Or grace in place of grace
[3] 1:18 Or seen God; the only God who; some manuscripts seen God; the only Son, who (see verse 14)
[4] 1:18 Greek in the bosom of the Father

(ESV)