Institutio Oratoria

and secondly, that if the intelligence is to be concentrated on such a vast subject as eloquence it must be free from all other distractions, among which must be included even those preoccupations which are free from blame. For it is only when it is free and self-possessed, with nothing to divert it or lure it elsewhere, that it will fix its attention solely on that goal, the attainment of which is the object of its preparations.

If on the other hand inordinate care for the development of our estates, excess of anxiety over household affairs, passionate devotion to hunting or the sacrifice of whole days to the shows of the theatre, rob our studies of much of the time that is their due (for every moment that is given to other things involves a loss of time for study), what, think you, will be the results of desire, avarice, and envy, which waken such violent thoughts within our souls that they disturb our very slumbers and our dreams?