Bhaktivinoda Thakura explains that sometimes persons want to take initiation to gain prestige, to remove past sins, or for material gain. Such persons are not approaching the guru or the holy name out of faith but with material motive. The spiritual master should not initiate such persons. Having no concept of the holy name’s true value, such persons will only remain indifferent to the holy name, and that will be an offense. Thus before accepting nama we must have both faith and at least some taste for chanting, at which point we can accept the vows to chant a minimum of sixteen rounds of the Hare Krishna mantra a day. When we take our vows, we should note the word “minimum” and always try to increase.
(LFD, Vol2, Faith—The Price for the Holy Name, Pg 92, 4th paragraph)