When the ear heard me. - A personification for “they who heard me speak, blessed me.” That is, they commended or praised me.
And when the eye saw me - All who saw me.
It gave witness to me - That is, the fixed attention to what he said and the admiration which was shown by the eyes of the multitudes, were witnesses of the respect and honor in which he was held. Gray has a beautiful expression similar to this when he says,
“He reads his history in a nation’s eyes.”