Institutio Oratoria

And if by perseverance of study he pass even beyond these gentler slopes, fruits for which none have toiled thrust themselves upon him, and all things spring forth unbidden; and yet if they be not gathered daily, they will wither away. But even such wealth must observe the mean, without which nothing is either praiseworthy or beneficial, while brilliance must be attended by manliness, and imagination by soundness of taste.