That the saying of Esaias the prophet might be fulfilled, which he spake, Lord, who hath believed our report? and to whom hath the arm of the Lord been revealed? That the saying of Esaias - Or, Thus the word of Isaiah was fulfilled. So I think ἱνα (commonly rendered that) should be translated. For it certainly does not mean the end the Pharisees had in view by not believing; nor the end which the prophet had in view in predicting the incredulity of the Jews; but simply, such a thing was spoken by the prophet, concerning the Jews of his own time, and it had its literal fulfillment in those of our Lord's time.
Our report - The testimony of the prophets, concerning the person, office, sufferings, death, and sacrifice of the Messiah. See Isaiah 53:1, etc.
The arm of the Lord - The power, strength, and miracles of Christ.