Can you then name one teaching of Christ that was so “clarified”? and how?
Off the top of my head, the meaning of universal Church was clarified by the Letter to the Smyrneans by St. Igantius of Antioch when he linked it to belief in the Eucharist and obedience to the bishop, thus rendering false the modern notion in some sects that they are "catholic".
In another example, the perverse Calvinist idea that man has no free will was dealt away with in Irenaeus: St. Irenaeus on Free Will (Adversus Haereses IV,37)
Every day I post the original Gospel and the Latin Gospel for the day, for example, Catholic Caucus: Daily Mass Readings, 01-03-11, Opt. Mem. Most Holy Name of Jesus. Having posted the texts I post the relevant patristic quotes in the next post, and then some art. You can follow these around and see for yourself how the Fathers of the Church clarify the scripture. The link to an excellent collection of patristic quotes organized by the Gospel verse is in my signature, if you want to do it at your own pace.