Albert Barnes on John 8:16

And yet, if I judge. If I should express my judgment of men or things. He was not limited, nor forbidden to do it, nor restrained by any fear that his judgment would be erroneous.

My judgment is true. Is worthy to be regarded.

For I am not alone. I concur with the Father who hath sent me. His judgment you admit would be right, and my judgment would accord with his. He was commissioned by his Father, and his judgment would coincide with all that God had purposed or revealed. This was shown by the evidence that God gave that he had sent him into the world.

(k) "my judgment" 1Sam 16:7, Ps 45:6,7, 72:2 (i) "for I am not alone" Jn 8:29, 16:32