 Olivi suggests here that God cannot bring about any effect in the created cause, which would help that cause to bring about its effect. The only way God can take part in the causal process is by acting directly as a co-cause, and this won’t do for reasons that Olivi laid down earlier. The upshot is that God cannot be a concurrent cause in any way. The main purpose of the examples involving heat and light is to make the philosophical (and theological) point clear: Olivi appeals to created causes in general to make his point about sinful actions of the will more plausible. But he does this in such a way that there seems to be little reason to doubt that he means to extend the rejection of concurrence to created causes generally.