Ownership is accepting that your response belongs to you.

Things happen to you that you did not choose, but the response is generated by you and belongs to you. That is a narrow claim and a significant one, because the response often determines more of what follows than the event did. Nobody else can make it, and nobody else is accountable for it.

When something knocks you sideways, give yourself a moment before responding and ask what response you would actually endorse. Then make that one. The gap between stimulus and reaction is small, and it is yours.