You could be good today. But instead you choose tomorrow. - Marcus Aurelius

The straightforward and good person should be like a smelly goat—you know when they are in the room with you.

Look round at the courses of the stars, as if thou wert going along with them; and constantly consider the changes of the elements into one another; for such thoughts purge away the filth of the terrene life.

As thou thyself art a component part of a social system, so let every act of thine be a component part of social life. Whatever act of thine that has no reference, either immediately or remotely, to a social end, this tears asunder thy life, and does not allow it to be one, and it is of the nature of a mutiny, just as when in a popular assembly a man acting by himself stands apart from the general agreement.