Therefore there is no need to seek properly qualified candidates for discharging devotional service to the Lord. Let them be either well behaved or ill trained, let them be either learned or fools, let them be either grossly attached or in the renounced order of life, let them be liberated souls or desirous of salvation, let them be inexpert in the discharge of devotional service or expert in the same, all of them can be elevated to the supreme position by discharging devotional service under the proper guidance.

(From Srila Prabhupada's purport to SB 2.9.36)