reasoning
Ὁ κόσμος σκηνή, ὁ βίος πάροδος· ἦλθες, εἶδες, ἀπῆλθες → The world is a stage, life is a performance, you came, you saw, you departed
Democritus, fr. 115 D-KEnglish > Greek (Woodhouse)
substantive
P. and V. λόγος, ὁ, Ar. and P. λογισμός, ὁ.
ratiocination: P. συλλογισμός, ὁ.