The exact meaning of the word sattvena is given by Sridhara Svami as being synonymous with dhairyena, or patience. One must perform devotional service with great patience. One should not give up the execution of devotional service because one or two attempts have not been successful. One must continue. Sri Rupa Gosvami also confirms that one should be very enthusiastic and execute devotional service with patience and confidence. Patience is necessary for developing the confidence that "Krsna will certainly accept me because I am engaging in devotional service." One has only to execute service according to the rules and regulations to insure success.
Srila Prabhupada, Srimad Bhagavatam 3.29.16 Purport
Srila Prabhupada, Srimad Bhagavatam 3.29.16 Purport
