Ekadasi occurs twice a month, on the eleventh day
of the bright fortnight and the dark fortnight. On these special days,
devotees fast from grains and beans and make an extra effort to render
devotional service to the Supreme Personality of Godhead, Lord Krishna.
Any person who observes an Ekadasi fast with devotion becomes free from
all difficulties and sins and after becoming purified, attains the abode
of Lord Krishna
(Hari Bhakti Vilasa 12/192 from Vayu Purana).
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