Whether human affairs are directed by Fate’s unalterable necessity, or by chance, is a question. The wisest of philosophers disagree on this point. [Epicureans] insist that heaven is unconcerned with our birth and death – is unconcerned, in fact, with human beings generally – with the result that good people often suffer while wicked people thrive. [The Stoics] disagree, maintaining that although things happen according to fate, this depends not on the movement of the planets but on the principles and logic of natural causality. This school concedes to us the freedom to choose our own lives.
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