The Church Father Origen (184/185 – 253/254 CE[77]) replied to the writer Celsus, a critic of Christianity, who had complained that some Christians had remodelled the Gospel to answer objections, agreeing that some had done so.[78] However, he stated that he did not believe the problem was widespread, nor did he approve of the practice, further stating that he believed that those making the alternations introduced "heresies opposed to the meaning of the doctrine of Jesus".[78]