Prabhupada's lecture - Śrīmad-Bhāgavatam 1.7.6 - Vṛndāvana, April 23, 1975
So actually our material knowledge, we have discovered this electricity just to counteract these sufferings of this material body. Kaṣṭān kāmān. This body is therefore anartha. Anartha means things which are not required. That is called anartha. Artha means things which we require, positive. And anartha means things which we do not require but unnecessarily imposed upon us. So that is suffering. We are thinking that we are enjoying this electric fan, but actually we are suffering; therefore the electric fan is required. So why this electric fan is required? Because the body is anartha; it has created the situation.
The same electric fan will be a trouble, a misery in winter season. The same body, the same electric fan—sometimes it is pleasing, and sometimes it is not pleasing. Therefore the conclusion is this body is anartha, not required. But people do not know that without this material body we can exist. Actually we are existing in spiritual body, and this material body is a covering of the spiritual body. Just like your shirt and coat are covering of your real body, similarly, this material body is covering of the spiritual body. We have got our spiritual body. So when a person comes to the understanding that "This body is anartha, unnecessarily imposed upon me," that is called knowledge. That is called brahma-jñāna. Brahma-bhūtaḥ prasannātmā [Bg. 18.54].