Page "Causality" Paragraph 12

All investigations of causality coming later in history will consist in imposing a favorite hierarchy on the order ( priority ) of causes ; such as " final > efficient > material > formal " ( Thomas 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 ).