St. Basil on the uniqueness of mankind.

“Cattle are terrestrial and bent towards the earth. Man, a celestial growth, rises superior to them as much by the mould of his bodily conformation as by the dignity of his soul. What is the form of quadrupeds? Their head is bent towards the earth and looks towards their belly, and only pursues their belly’s good. Your head, O man! Is turned towards heaven; your eyes look up. When therefore you degrade yourself by the passions of the flesh, slave of your belly, and your lowest parts, you approach animals without reason and becomest like one of them. You are called to more noble cares; seek those things which are above where Christ sits.  Raise your soul above the earth; draw from its natural conformation the rule of your conduct; fix your conversation in heaven. Your true country is the heavenly Jerusalem; your fellow citizens and your compatriots are the first-born which are written in heaven.

St. Basil the Great, Hexaemeron, Homily IX