If I were a nightingale, I should be singing as a nightingale; if a swan as a swan. But  as it is I am a rational being, therefore, I must be singing hymns of praise to God. – Epictetus (Diatr. 1.16.20-21)

The soul…ought to honor God not irrationally nor ignorantly, but with knowledge and reason. – Spec. Laws 1.209