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Let’s do some systematic theology, shall we? I’ll try to keep it interesting, and relevant. It may even be urgently important! Let’s do some theology together. Ready? Okay. Here we go.
If I take a hammer and bear its weight down upon a nail, the nail will comply and descend into a plank of wood. (Or it will slam onto my fingernail and bruise me badly.) Aristotle would call this an example of efficient cause: I employed a hammer to cause the nail to go into another object.
But there are three other classic, Aristotelian types of causes, three other ways one can make something happen, or bring something into being, or change something. There is the efficient cause, which I just described. Then there is the material cause: hammer, nail, wood, and fingernail — these objects are made of metal and trees and human flesh. The material causes the interaction of the four objects, simply by being the “stuff” the four objects are made of.