Institutio Oratoria

These critics show an insufficient appreciation of the capacities of the human mind, which is so swift and nimble and versatile, that it cannot be restricted to doing one thing only, but insists on devoting its attention to several different subjects not merely in one day, but actually at one and the same time.

Do not harpists simultaneously exert the memory and pay attention to the tone and inflexions of the voice, while the right hand runs over certain strings and the left plucks, stops or releases others, and even the foot is employed in beating time, all these actions being performed at the same moment?