You inquire why, if the devotee is struggling very hard to be free of the clutches of Maya, then how can he not be interested in such liberation? That is a contradiction. The devotee is not interested in liberation, but in serving; as such, the devotee is already liberated. So liberation is not very important business - it doesn't matter if he is liberated or nonliberated. The idea is that nobody should serve Krishna with motive, even up to liberation, he should serve for service sake.
Letter to, 27 February, 1972