Srila Rupa Gosvami, after retiring from his minister's seat in the government, went to Vrndavana and lived beneath a tree, like Maharaja Prthu. Since then, many people have gone to Vrndavana to imitate Rupa Gosvami's behavior. Instead of advancing in spiritual life, many have fallen into material habits and even in Vrndavana have become victims of illicit sex, gambling and intoxication. The Krsna consciousness movement has been introduced in the Western countries, but it is not possible for Westerners to go to the forest and practice the severe austerities which were ideally practiced by Prthu Maharaja or Rupa Gosvami. However, Westerners or anyone else can follow in the footsteps of Srila Bhaktisiddhanta Sarasvati Thakura by living in a temple, which is transcendental to residence in a forest, and to vow to accept krsna-prasada and nothing else, follow the regulative principles and chant sixteen rounds daily of the Hare Krsna mantra. In this way, one's spiritual life will never be disturbed.

From Srila Prabhupada's purport to SB 4.23.5