I have given you now some impression of what philosophy is. But I think that you will get a still clearer idea of its powers if I tell you what professions I make to those who want to become my pupils.

I say to them that if they are to excel in oratory or in managing affairs or in any line of work, they must, first of all, have a natural aptitude for that which they have elected to do; secondly, they must submit to training and master the knowledge of their particular subject, whatever it may be in each case; and, finally, they must become versed and practised in the use and application of their art; for only on these conditions can they become fully competent and pre-eminent in any line of endeavor.

In this process, master and pupil each has his place; no one but the pupil can furnish the necessary capacity; no one but the master, the ability to impart knowledge while both have a part in the exercises of practical application: for the master must painstakingly direct his pupil, and the latter must rigidly follow the master's instructions.