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For in all the habits which we have expressly mentioned, as

likewise in all the others, there is, so to speak, a mark with

his eye fixed on which the man who has Reason tightens or slacks

his rope;[1] and there is a certain limit of those mean states

which we say are in accordance with Right Reason, and lie between

excess on the one hand and defect on the other.

Now to speak thus is true enough but conveys no very definite

meaning: as, in fact, in all other pursuits requiring attention

and diligence on which skill and science are brought to bear; it

is quite true of course to say that men are neither to labour nor

relax too much or too little, but in moderation, and as Right

Reason directs; yet if this were all a man had he would not be

greatly the wiser; as, for instance, if in answer to the

question, what are proper applications to the body, he were to be

told, "Oh! of course, whatever the science of medicine, and in

such manner as the physician, directs."