John Calvin on John 14:7

7. If you had known me. He confirms what we have just now said, that it is a foolish and pernicious curiosity, when men, not satisfied with him, attempt to go to God by indirect and crooked paths. “Par voyes obliques et tortues.” They admit that there is nothing better than the knowledge of God; but when he is near them, and speaks to them familiarly, they wander through their own speculations, and seek above the clouds him whom they do not deign to acknowledge as present. Christ, therefore, blames the disciples for not acknowledging that the fullness of the Godhead was manifested in him. “I see,” (says he,) “that hitherto you have not known me in a right and proper manner, because you do not yet acknowledge the lively image of the Father which is exhibited in me.”

And henceforth you know him, and have seen him. He adds this, not only to soften the severity of the reproof, but likewise to accuse them of ingratitude and slothfulness, if they do not consider and inquire what has been given to them; for he said this rather for the purpose of commending his doctrine than of extolling their faith. The meaning therefore is, that God is now plainly exhibited to them if they would but open their eyes. The word see expresses the certainty of faith.

John 14:8-14

8. Philip saith to him, Lord, show us the Father, and it sufficeth us. 9. Jesus saith to him, Have I been so long time with you, and hast thou not known me, Philip? He who hath seen me hath seen the Father; and how sayest thou, Show us the Father? 10. Believest thou not that I am in the Father, and the Father in me? The words which I speak to you I speak not from myself; but my Father who dwelleth in me, he doeth the works. 11. Believe me, that I am in the Father, and the Father in me; but if not, believe me on account of the works themselves. 12. Verily, verily, I tell you, He who believeth in me shall himself also do the works which I do, and shall do greater works than these, because I go to my Father. 13. And whatever you ask in my name, that I will do, that the Father may be, glorified in the Son. 14. If you shall ask any thing in my name, I will do it.