St. Thomas Aquinas on Christ's Fitting Example Through Suffering

The sin of man consists in cleaving to bodily things and neglecting spiritual goods. Therefore the Son of God in his human nature fittingly showed by what he did and suffered that men should consider temporal goods or evils as nothing, lest a disordered love for them impede them from being dedicated to spiritual things. Thus Christ chose poor parents, although perfect in virtue, lest anyone glory in mere nobility of flesh and in the wealth of his parents. He led a poor life to teach us to despise riches. He lived without titles or office so as to withdraw men from a disordered desire for these things. He underwent labour, thirst, hunger and bodily afflictions so that men would not be fixed on pleasure and delights and be drawn away from the good of virtue because of the hardships of this life. In the end he underwent death, so that no one would desert the truth because of fear of death. And lest anyone fear a shameful death for the sake of the truth, he chose the most horrible kind of death, that of the cross. Thus it was fitting that the Son of God made man should suffer and by his example provoke men to virtue, so as to verify what Peter said (1 Pet 2:21): "Christ suffered for you, and left an example for you to follow in his steps."

Then, because not only good conduct and avoiding sins is necessary for salvation, but also the knowledge of truth so as to avoid error, it was necessary for the restoration of the human race that the only-begotten Word of God who assumed a human nature should ground people in truth by a sure knowledge of it. Truth taught by men is not so firmly believed, because man can deceive. Only by God can knowledge of the truth be confirmed without any doubt.

So the Son of God made man had to propose the teaching of divine truth to men, showing them that it came from God and not from man. He did this by many miracles. Since he did things that only God can do, such as raising the dead, giving sight to the blind etc., people had to believe that he spoke with God's authority.

Those who were present could see his miracles, but later generations might say they were made up. Therefore Divine Wisdom provided a remedy against this in Christ's state of weakness. For if he were rich, powerful and established in high dignity, it could be thought that his teaching and his miracles were received on account of his favour and human power. So to make the work of divine power apparent, he chose everything that was rejected and low in the world, a poor mother and a poor life, illiterate disciples and messengers, and allowed himself to be rebuked and condemned even to death by the magnates of this world. This made it apparent that his miracles and teaching were not received because of human power, but should be attributed to divine power. Thus in what he did or suffered, human weakness and divine power were joined together at the same time. Thus at his nativity he was wrapped in cloth and put in a manger, but praised by the angels and adored by the Magi led by a star. He was tempted by the devil, but ministered to by angels. He lived without money as a beggar, but raised the dead and gave sight to the blind. He died fixed to the cross and numbered among thieves, but at his death the sun darkened, the earth trembled, stones split, graves opened and the bodies of the dead were raised.

Therefore if anyone considers the great fruit of such beginnings, namely, the conversion of peoples over [nearly the whole] world to Christ, and wants further signs in order to believe, he must be considered harder than a stone, since at Christ's death even stones were shattered. Thus the Apostle says (1 Cor 1:18): "The message of the cross is folly for those who are on the way to ruin, but for those of us who are on the road to salvation it is the power of God."

Source: St. Thomas Aquinas, De Rationibus Fidei, trans. by Joseph Kenny, DHS Priory Website, accessed October 30, 2013, http://www.dhspriory.org/thomas/Rationes.htm, chapter 7.