Objectivism holds that it’s vital to understand what things are under our control and what are not. To avoid passive resignation toward what we can change and futile rebellion against the unchangeable, we need to internalize the right perspective on this issue. This talk contrasts the Objectivist perspective on this question with that of Stoicism. Both philosophies regard the issue as of central practical importance to a good life, but they differ in fundamental ways that are instructive to explore.