Second Lecture

Now the great difficulty arose for him in making it understandable how three could be one and one three. In ancient times, when there were still clairvoyant concepts, it was not particularly difficult to imagine this. But for the time when everything falls apart through concepts and nothing can be properly connected anymore, the difficulty arose. Tertullian used a nice comparison to make it clear how one can be three and three one. He said: Take the source. From the source comes the brook, from the brook comes the river. If we ask about the river, we say: It comes from the spring through the brook; from the spring through the brook. Or take, he said, for comparison the roots, the shoots, the fruit: the fruit comes from the root through the shoot. — Tertullian needed a third comparison, saying: The little flame of light comes from the sun, carried through the cosmos. Thus, he said, one must imagine that the Spirit comes from the Father through the Son. And just as this trinity – source, brook, river – does not contradict the unity that the river is in reality, so the fact that the Spirit comes from the Father through the Son does not contradict the unified development of Father, Son and Spirit.