Remember that as it is a shame to be surprised if the fig-tree produces figs, so it is to be surprised if the world produces such and such things of which it is productive; and for the physician and the helmsman it is a shame to be surprised, if a man has a fever, or if the wind is unfavourable.

Remember that to change thy opinion and to follow him who corrects thy error is as consistent with freedom as it is to persist in thy error. For it is thy own, the activity which is exerted according to thy own movement and judgement, and indeed according to thy own understanding too.

If a thing is in thy own power, why dost thou do it? But if it is in the power of another, whom dost thou blame? The atoms [chance] or the gods? Both are foolish. Thou must blame nobody. For if thou canst, correct that which is the cause; but if thou canst not do this, correct at least the thing itself; but if thou canst not do even this, of what use is it to thee to find fault? For nothing should be done without a purpose.