I think that when a Stoic concerns himself with things over which he has some but not complete control, such as winning a tennis match, he will be very careful about the goals he sets for himself. In particular, he will be careful to set internal rather than external goals. Thus, his goal in playing tennis will not be to win a match (something external, over which he has only partial control) but to play to the best of his ability in the match (something internal, over which he has complete control). By choosing this goal, he will spare himself frustration or disappointment should he lose the
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