So when you may feel morose, chant Hare Krsna Mantra loudly and hear it. That will reestablish you on the platform of transcendental bliss. Sometimes it appears that the devotee is put into some difficulty unreasonably, but the devotee does not take even this adverse circumstance as other that a manifestation of the Lord's Supreme Mercy. Anyway, such feelings come and go like seasonal changes and we should not deviate for that reason from our prescribed duty.
Letter to Visnujana Maharaja, 8 January, 1971