Universal Journal of Physics and Application Vol. 4(2), pp. 303 - 314
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Does every event have a cause? An answer is not simple. The notion of cause contains a particular being y acting on being x plus everything that may be called the boundary conditions. These may form necessary and sufficient conditions giving rise to a strong cause, or only necessary conditions, giving rise to a weak cause. These matters are discussed in this article with particular attention being paid to the argumentation of Thomas Aquinas known as prima via. Prima via is the analysis of a cause-effect sequence which leads (according to Thomas) to a First Cause (First Mover). It seems that the extrapolation of the cause-effect sequence to infinity is permissible from the logical point of view. But the possibility of weak causes seems to destroy the cause-effect “line”. Here it is perhaps useful to “escape” to the metaphysical abstraction which looks at things sub ratione entitatis. If we ignore space and time (which is characteristic of this abstraction) we are led to believe that the IS of cause is finally unavoidable, which means that from the vantage point of this abstraction, i.e. from the point of view of IS, all causes are strong.