This is Krsna consciousness. You have to act by the desires of Krsna. That is the proper use of your senses. You cannot use for your purpose. Anything… Just like you are working in some establishment. Anything in that establishment, you can use for the proprietor's business. You cannot use it. Just like in hospital there are blankets. It is written there, "Hospital Property." So long you are in the hospital, you can use it. But you cannot take it outside. Then you are criminal. Similarly, everything… Isavasyam idam sarvam [Iso mantra 1]. Everything belongs to God, and you can use it for the service of God. Tena tyaktena bhunjitha ma grdhah kasya svid dhanam. This is the instruction, Vedic instruction. You can use it as prasadam, but everything should be offered to the Supreme. Yajnarthe karmanah loko 'yam karma-bandhanah [Bg. 3.9]. If you do not do that, if you engage yourself always in good activities, as the karmis they do, and earn money and use it for your own sense gratification, that is papa.
yajna-sistasinah santo
mucyante sarva-kilbisaih
 bhunjate te tv agham papa
ye pacanty atma-karanat
 [Bg. 3.13]
Those who are cooking in the kitchen very palatable dishes for satisfying the tongue, they are simply eating sinful things. Ye pacanty atma-karanat. So therefore, if we become sinful every moment, how we can become happy? It is not possible. If you want to become happy, you have to become pious. And the standard of piety is to become Krsna conscious, devotee of Krsna. That is the highest perfection of life.

Srila Prabhupada, Srimad-Bhagavatam 3.26.28 — January 5, 1975, Bombay