“…each one ought to take up a subject of such weight as to be a fair burden for his own shoulders, so that their strength may not be too heavily taxed and he be forced to tumble into the mud. This is the advice our master Horace gives us when he says, in the beginning of his Art of Poetry, ‘Ye who write, take up a subject suited to your strength.’”
–Dante (as quoted by James Wright)
found in The New Naked Poetry