“Knowledge means knowing things as they are, and if by deliberation it is found that there are things which are at all unnecessary, naturally the person who has acquired knowledge leaves aside such unwanted things. When the conditioned soul finds by culture of knowledge that material necessities are unwanted things, he becomes detached from such unwanted things. This stage of knowledge is called vairagya, or detachment from unwanted things.” (Shrila Prabhupada, Shrimad Bhagavatam, 2.2.12 Purport)