Civilized people are taught by logic, barbarians, by necessity, communities by tradition; and the lesson inculcated even in wild beasts by nature itself. They learn that they have to defend their own bodies and persons lives from violence of any and every kind by all means within their power.
Marcus Tullius CiceroThrough ignorance of what is good and what is bad, the life of men is greatly perplexed.
Marcus Tullius Cicero