Sri Caitanya-caritamrta, Madhya-lila 13.137, purport by Srila Prabhupada:

The mind’s activities are thinking, feeling and willing, by which the mind accepts materially favorable things and rejects the unfavorable. This is the consciousness of people in general. But when one’s mind does not accept and reject but simply becomes fixed on the lotus feet of Krsna, then one’s mind becomes as good as Vrndavana. Wherever Krsna is, there also are Srimati Radharani, the gopis, the cowherd boys and all the other inhabitants of Vrndavana. Thus as soon as one fixes Krsna in his mind, his mind becomes identical with Vrndavana. In other words, when one’s mind is completely free from all material desires and is engaged only in the service of the Supreme Personality of Godhead, then one always lives in Vrndavana, and nowhere else.