Sec. IV. To speak generally, what we are wont to say about the arts and sciences is also true of moral excellence, for to its perfect development three things must meet together, natural ability, theory, and practice. By theory I mean training, and by practice working at one's craft. Now the foundation must be laid in training, and practice gives facility, but perfection is attained only by the junction of all three. For if any one of these elements be wanting, excellence must be so far deficient. For natural ability without training is blind: and training without natural ability is defective, and practice without both natural ability and training is imperfect. For just as in farming the first requisite is good soil, next a good farmer, next good seed, so also here: the soil corresponds to natural ability, the training to the farmer, the seed to precepts and instruction. I should therefore maintain stoutly that these three elements were found combined in the souls of such universally famous men as Pythagoras, and Socrates, and Plato, and of all who have won undying fame. Happy at any rate and dear to the gods is he to whom any deity has vouchsafed all these elements! But if anyone thinks that those who have not good natural ability cannot to some extent make up for the deficiencies of nature by right training and practice, let such a one know that he is very wide of the mark, if not out of it altogether. For good natural parts are impaired by sloth; while inferior ability is mended by training: and while simple things escape the eyes of the careless, difficult things are reached by painstaking. The wonderful efficacy and power of long and continuous labour you may see indeed every day in the world around you.[6] Thus water continually dropping wears away rocks: and iron and steel are moulded by the hands of the artificer: and chariot wheels bent by some strain can never recover their original symmetry: and the crooked staves of actors can never be made straight. But by toil what is contrary to nature becomes stronger than even nature itself. And are these the only things that teach the power of diligence? Not so: ten thousand things teach the same truth. A soil naturally good becomes by neglect barren, and the better its original condition, the worse its ultimate state if uncared for. On the other hand a soil exceedingly rough and sterile by being farmed well produces excellent crops. And what trees do not by neglect become gnarled and unfruitful, whereas by pruning they become fruitful and productive? And what constitution so good but it is marred and impaired by sloth, luxury, and too full habit? And what weak constitution has not derived benefit from exercise and athletics? And what horses broken in young are not docile to their riders? while if they are not broken in till late they become hard-mouthed and unmanageable. And why should we be surprised at similar cases, seeing