"It has been ordained that there be summer and winter, abundance and dearth, virtue and vice, and all such opposites for the harmony of the whole, and (Zeus) has given each of us a body, property, and companions."
"The happy life is a life that is in harmony with its own nature."
"Let us keep to the way which Nature has mapped out for us, and let us not swerve therefrom. If we follow Nature, all is easy and unobstructed; but if we combat Nature, our life differs not a whit from that of men who row against the current."
"We are members of one great body, planted by nature…. We must consider that we were born for the good of the whole."
"Observe always that everything is the result of change, and get used to thinking that there is nothing Nature loves so well as to change existing forms and make new ones like them."