vindicating

Nero said: What do you say, Peter? He answered and said: All that Paul has said is true. For when he was a persecutor of the faith of Christ, a voice called him out of heaven, and taught him the truth; for he was not an adversary of our faith from hatred, but from ignorance. For there were before us false Christs, like Simon, false apostles, and false prophets, who, contrary to the sacred writings, set themselves to make void the truth; and against these it was necessary to have in readiness this man, who from his youth up set himself to no other thing than to search out the mysteries of the divine law, by which he might become a vindicator of truth and a persecutor of falsehood. Since, then, his persecution was not on account of hatred, but on account of the vindication of the law, the very truth out of heaven held intercourse with him, saying, I am the truth which you persecute; cease persecuting me. When, therefore, he knew that this was so, leaving off that which he was vindicating, he began to vindicate this way of Christ which he was persecuting.