Marcus Aurelius, Meditations
In a sense, people are out proper occupation. Our job is to do them good and put up with them.
But when they obstruct our proper tasks, they become irrelevant to us - like sun, wind, animals. Our actions may be impeded by them, but there can be no impeding our intentions or our dispositions. Because we can accommodate and adapt. The mind adapts and converts to its own purposes the obstacle to our acting.
The impediment to action advances action.
What stands in the way becomes the way.