To the preceding remarks he adds the following: “Since a divine Spirit inhabited the body (of Jesus), it must certainly have been different from that of other beings, in respect of grandeur, or beauty, or strength, or voice, or impressiveness, or persuasiveness. For it is impossible that He, to whom was imparted some divine quality beyond other beings, should not differ from others; whereas this person did not differ in any respect from another, but was, as they report, little, and ill-favoured, and ignoble.” Now it is evident by these words, that when Celsus wishes to bring a charge against Jesus, he adduces the sacred writings, as one who believed them to be writings apparently fitted to afford a handle for a charge against Him; but wherever, in the same writings, statements would appear to be made opposed to those charges which are adduced, he pretends not even to know them!
There are, indeed, admitted to be recorded some statements respecting the body of Jesus having been “ill-favoured;” not, however, “ignoble,” as has been stated, nor is there any certain evidence that he was “little.” The language of Isaiah runs as follows, who prophesied regarding Him that He would come and visit the multitude, not in comeliness of form, nor in any surpassing beauty: “Lord, who has believed our report, and to whom was the arm of the Lord revealed? He made announcement before Him, as a child, as a root in a thirsty ground.
He has no form nor glory, and we beheld Him, and He had no form nor beauty; but His form was without honour, and inferior to that of the sons of men.” These passages, then, Celsus listened to, because he thought they were of use to him in bringing a charge against Jesus; but he paid no attention to the words of the forty-fifth Psalm, and why it is then said, “Gird Your sword upon Your thigh, O most mighty, with Your comeliness and beauty; and continue, and prosper, and reign.”
Source: Against Celsus (New Advent)