Definition: (1) Dukkha, the truth of suffering; (2) Samudaya, the truth of the origin of suffering; (3) the truth of the cessation of suffering; (4) Magga, the truth of the path to the cessation of suffering.
Insight: Buddha blamed suffering on desire - tanha. Desire has three negative types [poisons] - greed, ignorance, and hatred.
Thich Nhat Hanh was challenges about his commitment to non violence:
'What if someone had wiped out all the Buddhists in the world and you were the last one left. Would you not try to kill the person who was trying to kill you, and in doing so save Buddhism?’ Thich Nhat Hanh replied: "It would be better to let him kill me. If there is any truth to Buddhism and the dharma, it will not disappear from the face of the Earth, but will reappear when seekers of truth are ready to rediscover it. In killing I would be betraying and abandoning the very teachings I would be seeking to preserve. So it would be better to let him kill me and remain true to the spirit of the dharma."