Philo Judaeus De Migratione Abrahami 72

[72] for many men think, indeed, most excellently, but are betrayed by a bad interpreter, namely, speech, because they have not throughly worked up the whole course of encyclical instruction. Others, again, have been exceedingly skilful in explaining their ideas, but very bad hands at forming intentions, as, for instance, those who are called sophists, for the mind of these sophists is destitute of all harmony and of all real learning; but their speeches, which are uttered by the organs of their voice, are full of music and beauty.