We should not judge the apparent success or failure of others by the immediate result or lack of result. Rather, we should look to see how much the devotee is willing to serve, how steady he has become, and how devoted to the order he has received. Then we can understand that in due course of time the Lord may selecct that devotee to fulfill His purpose.
Mukam Karoti Vacalam vol 1, "Excelling the Disciplic Succession by their blessing"