159. Since, then, He has a share in the kingdom, what hinders us from understanding that it was the Holy Spirit by Whom Isaiah was sent? For on the authority of Paul we cannot doubt, whose judgment the Evangelist Luke so much approved in the Acts of the Apostles as to write as follows in Paul’s words: “Well spake the Holy Spirit through Isaiah the prophet to our fathers, saying: Go to this people and say, Ye shall hear with the ear and shall not understand, and seeing ye shall see and shall not perceive.” Acts xxviii. 25, 26.