In any condition you can become purified!
Srila Prabhupada: The real point is that narayana-paranmukham. Without thinking of Narayana or Krsna or Visnu, no method will be able to purify you. Vita-raga-bhaya-krodha, mam upasritah… [Being freed from attachment, fear and anger, being fully absorbed in Me and taking refuge in Me, many, many persons in the past became purified by knowledge of Me – and thus they all attained transcendental love for Me. (Bhagavad-gita, 4.10.)] – the simple process to become purified. And that simple process is this chanting. Chanting Hare Krsna, Hare Krsna, this name “Krsna” is reminding me. I must hear and I must chant with the tongue. Then you keep yourself always in Krsna consciousness. Our method is very simple. It doesn’t require much education or to become rich or become beautiful or to take birth in a high family. No. In any condition. Ahaituky apratihata. If you want to chant the Hare Krsna mantra, there is no impediment in the world. You can, walking on the street, chant Hare Krsna. That will keep you purified.
From a lecture by Srila Prabhupada in Denver July 1, 1975.