SB 9.9.47
athesa-maya-racitesu sangam
gunesu gandharva-puropamesu
rudham prakrtyatmani visva-kartur
bhavena hitva tam aham prapadye
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Therefore I should now give up my attachment for things created by the external energy of the Supreme Personality of Godhead. I should engage in thought of the Lord and should thus surrender unto Him. This material creation, having been created by the external energy of the Lord, is like an imaginary town visualized on a hill or in a forest. Every conditioned soul has a natural attraction and attachment for material things, but one must simply give up this attachment and surrender unto the Supreme Personality of Godhead.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When passing through a mountainous region in an airplane, one may sometimes see a city in the sky with towers and palaces, or one may see similar things in a big forest. This is called a gandharva-pura, a phantasmagoria. This entire world resembles such a phantasmagoria, and every materially situated person has attachment for it. But Khatvanga Maharaja, because of his advanced Krsna consciousness, was not interested in such things. Even though a devotee may engage in apparently materialistic activities, he knows his position very well. Nirbandhah krsna-sambandhe yuktam vairagyam ucyate. If one engages all material things in relation with the loving service of the Lord, one is situated in yukta-vairagya, proper renunciation. In this material world, nothing should be accepted for one’s sense gratification: everything should be accepted for the service of the Lord. This is the mentality of the spiritual world. Maharaja Khatvanga advises that one give up material attachments and surrender unto the Supreme Personality of Godhead. Thus one achieves success in life. This is pure bhakti-yoga, which involves vairagya-vidya — renunciation and knowledge.
vairagya-vidya-nija-bhakti-yoga-
siksartham ekah purusah puranah
sri-krsna-caitanya-sarira-dhari
krpambudhir yas tam aham prapadye
“Let me surrender unto the Personality of Godhead who has appeared now as Lord Sri Caitanya Mahaprabhu. He is the ocean of all mercy and has come down to teach us material detachment, learning and devotional service to Himself.” (Caitanya-candrodaya-nataka 6.74) Sri Krsna Caitanya Mahaprabhu inaugurated this movement of vairagya-vidya, by which one detaches himself from material existence and engages in loving devotional service. The Krsna consciousness movement of devotional service is the only process by which to counteract our false prestige in this material world.