|Canto 4: Creation of the Fourth Order||Chapter 25: The Descriptions of the Characteristics of King Purañjana|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 4.25.53
nirṛtir nāma paścād dvās
tayā yāti purañjanaḥ
vaiśasaḿ nāma viṣayaḿ
nirṛtiḥ — of the name Nirṛti; nāma — called; paścāt — western; dvāḥ — gate; tayā — by which; yāti — used to go; purañjanaḥ — King Purañjana; vaiśasam — of the name Vaiśasa; nāma — called; viṣayam — to the place; lubdhakena — by the friend named Lubdhaka; samanvitaḥ — accompanied.
Another gate on the western side was known as Nirṛti. Purañjana used to go through this gate to the place known as Vaiśasa, accompanied by his friend Lubdhaka.
This is a reference to the rectum. The rectum is supposed to be situated on the western side of the eyes, nose and ears. This gate is especially meant for death. When an ordinary living entity abandons his present body, he passes through the rectum. It is therefore painful. When one is called by nature to evacuate, one also experiences pain. The friend of the living entity who accompanies him through this gate is named Lubdhaka, which means "greed." Due to our greed, we eat unnecessarily, and such gluttony causes pain at the time of evacuation. The conclusion is that the living entity feels well if he evacuates properly. This gate is known as Nirṛti, or the painful gate.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness