[496] Then, Prince, this thought occurred to me: 'Suppose I were to meditate on the breathless absorption (appānaka jhāna).' So, Prince, I stopped the in-breaths and out-breaths through my mouth and nose. When my in-breaths and out-breaths through mouth and nose were stopped, Prince, there was an exceedingly loud sound of winds escaping through my ear-holes. Just as there is an exceedingly loud sound when a smith's bellows is being blown, even so, Prince, when my in-breaths and out-breaths through mouth and nose were stopped, there was an exceedingly loud sound of winds escaping through my ear-holes. And yet, Prince, my energy (vīriya) was aroused and unflagging, and my mindfulness was established and unmuddled; but my body was strained and not tranquil, for I was overwhelmed by that painful striving.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.