"If one serves faithfully, there is no possibility of frustration because the Lord Himself takes charge of the devotee's advancement. The Lord is seated in everyone's heart, and He knows the devotee's motive and arranges everything achievable. In other words, the pseudo devotee, who is anxious to achieve material gains, cannot attain the highest perfectional stage because the Lord is in knowledge of his motive. One merely has to become sincere in his purpose, and then the Lord is there to help in every way."
Srimad Bhagavatam 3.13.50