[312] Bhikkhus, suppose there were a wet, sappy piece of wood. Then a man might come along, taking an upper fire-stick, thinking: "I shall kindle a fire, I shall produce the fire element (tejodhātu)." What do you think, bhikkhus — could that man, taking the upper fire-stick and drilling against that wet, sappy piece of wood, kindle a fire and produce the fire element?
"No indeed, venerable sir."
"Even so, bhikkhus, in whomever mindfulness directed to the body (kāyagatā sati) has been developed and cultivated, Māra does not find an opening in him, Māra does not find a foothold in him."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.