Institutio Oratoria

Now I regard the orator above all as being a man of virtue and good sense, who will not be seriously troubled, after having devoted himself to the study of that which is excellent by nature, if some legal expert disagrees with him; for even they are allowed to disagree among themselves. But if he further wishes to know the views of everyone, he will require to read, and reading is the least laborious of' all the tasks that fall to the student's lot.