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John Gill
If I bear witness of myself,.... Which was not allowed any man to do; nor indeed is it proper that a man should be a witness in his own cause: and, according to the Jewish canons, a man might not be a witness for his wife, because she was reckoned as himself. "An husband is not to be believed in bearing witness for his wife, that had been carried captive, that she is not defiled, שאין אדם מעיד...
Matthew Henry
We have in the gospels a faithful record of all that Jesus began both to do and to teach, Acts i. 1. These two are interwoven, because what he taught explained what he did, and what he did confirmed what he taught. Accordingly, we have in this chapter a miracle and a sermon. I. The miracle was the cure of an impotent man that had been diseased thirty-eight years, with the circumstances of that...
Charles H. Spurgeon
If I bear witness of myself, my witness is not true. He did bear witness to himself by his miracles, but that was not the witness upon which he relied, nor was it the only witness to the truth of his mission.