And the Father himself, which hath sent me, hath borne witness of me. Ye have neither heard his voice at any time, nor seen his shape.
And the Father himself hath borne witness of me - not referring, probably, to the voice at His baptism, but, as seems from what follows, to the testimony of the Old Testament Scriptures. (So Calvin, Lucke, Meyer, Luthardt.)
Ye have neither heard his voice at any time, nor seen his shape - never recognized Him in this character. The words as Stier remarks, are designedly mysterious, like many others which our Lord uttered.