“…The study of Nibbāna in daily life is possible in order to have a better understanding of and a greater interest in Nibbāna’s meaning. When seeing a fire go out or something hot cooling down, look for the meaning of Nibbāna in it. When bathing or drinking ice water, when a breeze blows or rain falls, take notice of the meaning of Nibbāna. When a fever subsides, a swelling goes down, or a headache goes away, recognize the meaning of Nibbāna as found in those things. When perspiring, sleeping comfortably, or eating one’s healthy fill, see the meaning of Nibbāna. When seeing an animal with all its fierceness and danger tamed away, see the meaning of Nibbāna. All of these are lessons to help us understand the nature of Nibbāna in every moment. The mind will regularly incline towards contentment in Nibbāna and this helps the mind to flow more easily along the path of Nibbāna.
Whenever you find coolness in your experience, mark that coolness firmly in your heart, and breathe out and in. Breathing in is cool, breathing out is cool. In cool, out cool – do this for a little while. This is an excellent lesson that will help you to become a lover of Nibbāna (Nibbānakāmo) more quickly. The instincts will develop in an enlightened (bodhi) way more than if you don’t practice like this. Natural Nibbāna – the unconscious quenching of defilement – will occur more often and easily. This is the best way to help nature…”