On The Cross:

For although the sacred and inspired Scriptures are sufficient to declare the truth,--while there are other works of our blessed teachers compiled for this purpose, if he meet with which a man will gain some knowledge of the interpretation of the Scriptures, and be able to learn what he wishes to know,--still, as we have not at present in our hands the compositions of our teachers, we must communicate in writing to you what we learned from them,--the faith, namely, of Christ the Saviour; lest any should hold cheap the doctrine taught among us, or think faith. in Christ unreasonable. For this is what the Gentiles traduce and scoff at, and laugh loudly at us, insisting on the one fact of the Cross of Christ; and it is just here that one must pity their want of sense, because when they traduce the Cross of Christ they do not see that its power has filled all the world, and that by it the effects of the knowledge of God are made manifest to all. For they would not have scoffed at such a fact, had they, too, been men who genuinely gave heed to His divine Nature. On the contrary, they in their turn would have recognised this man as Saviour of the world, and that the Cross has been not a disaster, but a healing of Creation.

ST. ATHANASIUS ( AGAINST THE HEATHEN)