“By the general process of epic poetry, I mean the way this form of art has constantly responded to the profound needs of the society in which it was made.”
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Epic poetry exhibits life in some great symbolic attitude. It cannot strictly be said to symbolize life itself, but always some manner of life.
The Border Ballads, for instance, and the Robin Hood Ballads, clearly suppose a state of society which is nothing but a very circumscribed and not very important heroic age.
The balance of private good and general welfare is at the bottom of civilized morals but the morals of the Heroic Age are founded on individuality, and on nothing else.
That is to say, epic poetry has been invented many times and independently but, as the needs which prompted the invention have been broadly similar, so the invention itself has been.