Eknath Easwaran's Commentary
When we live for others, we’ll find we are less oppressed by the natural changeability of life. Instead of wanting, even demanding, that everything go our way, we’ll feel at peace when everything is going everybody else’s way. In other words, we will be less likely to get discouraged or depressed by the normal ups and downs of life.
And when we are able to function freely in all the varied relationships and vicissitudes of life, we will gradually find an inner certitude that we are equal to every challenge. Then, just because somebody is agitated, we won’t be afraid. Just because someone is unfavorably disposed towards us, we will not get diffident or annoyed. The Buddha says these outward changes of fortune can never affect our joy, which is permanent.