All investigations of causality coming later in history will consist in imposing a favorite hierarchy on the order (priority) of causes; such as "final &gt; efficient &gt; material &gt; formal" (Aquinas), or in restricting all causality to the material and efficient causes or, to the efficient causality (deterministic or chance), or just to regular sequences and correlations of natural phenomena (the natural sciences describing "how" things happen rather than asking "why" they happen).