Book 3.7

Be assured that the same rule applies both to public and private life: simple and manageable undertakings proceed according to the pleasure of the person in charge of them, but enormous ones, beyond his capacity to manage, are not easily undertaken. When he has got them to administer, they hinder him, and press hard upon him, and just as he thinks that success is within his grasp, they collapse, and carry him with them: thus it comes about that a man's wishes are often disappointed if he does not apply himself to easy tasks, yet wishes that the tasks which he undertakes may be easy. Whenever you would attempt anything, first form an estimate both of your own powers, of the extent of the matter which you are undertaking, and of the means by which you are to accomplish it: for if you have to abandon your work when it is half done, the disappointment will sour your temper. In such cases, it makes a difference whether one is of an ardent or of a cold and unenterprising temperament: for failure will rouse a generous spirit to anger, and will move a sluggish and dull one to sorrow. Let our undertakings, therefore, be neither petty nor yet presumptuous and reckless: let our hopes not range far from home: let us attempt nothing which if we succeed will make us astonished at our success.