Unification of Body, mind, and Heart. The functions of Samadhi. The Buddha's 4 guidelines on mindfulness of the breath: The long breath, the short breath, experiencing the whole body, and calming the body as you breathe in and out.
Courage is contagious. Nelson Mandela spoke of the "multiplication of courage": When one brave person is willing to speak the truth, even though it might be met with strong resistance, it can spark another voice in the wilderness to do the same. And then other voices can be inspired to join in too. That is often how dramatic change can happen.