The Related Suttas Collection 46.11

2. Sick

Living Creatures

“Bhikkhus, living creatures engage in the four postures: sometimes walking, sometimes standing, sometimes sitting, sometimes lying down. They do so depending on the earth and grounded on the earth. In the same way, a bhikkhu develops and cultivates the seven awakening factors depending on and grounded on ethics.

And how does a bhikkhu develop the seven awakening factors depending on and grounded on ethics? It’s when a bhikkhu develops the awakening factors of mindfulness, investigation of principles, energy, (mental) joy, tranquility, samādhi, and equanimity, which rely on seclusion, fading away, and cessation, and ripen as letting go. That’s how a bhikkhu develops and cultivates the seven awakening factors depending on and grounded on ethics.”