Jamieson, Fausset & Brown

There is another--that is, the Father, as is plain from the connection. How brightly the distinction of the Persons shines out here! and I know that the witness, &c.--"This is the Son's testimony to the Father's truth (see Joh 7:28; Joh 8:26, Joh 8:55). It testifies to the full consciousness on the part of the Son, even in the days of His humiliation, of the righteousness of the Father" [ALFORD]. And thus He cheered His spirit under the cloud of human opposition which was already gathering over His head.