Institutio Oratoria

I do not approve of boys sitting mixed with young men. For even if the teacher be such an one as we should desire to see in charge of the morals and studies of the young, and can keep his youthful pupils under proper control, it is none the less desirable to keep the weaker members separate from the more mature, and to avoid not only the actual charge of corruption but the merest suspicion of it.

I have thought it worth while to put my views on this subject quite briefly. For I do not think it necessary even to warn the teacher that both he and his school must be free from the grosser vices. And should there be any father who does not trouble to choose a teacher for his son who is free from the obvious taint of immorality, he may rest assured that all the other precepts, which I am attempting to lay down for the benefit of our youth, will be absolutely useless to him, if he neglects this.