One should not be impatient in discharging devotional service, but should take instruction from the spiritual master and execute them with patience depending on the mercy of Guru and Krishna. The successful execution of Krishna conscious activities requires both patience and confidence? The devotee thinks "Krishna will surely protect me and give me help for the successful execution of devotional service." This is called confidence. — The Nectar of instruction, Text 03.
The real result of devotional service is the awakening of pure love for the Supreme Personality of Godhead, which continues under all circumstances.
Srimad Bhagavatam 5.24.19,
The manifestation of unadulterated devotional service is exhibited when one’s mind is at once attracted to hearing the transcendental name and qualities of the Supreme Personality of Godhead, who is residing in everyone’s heart.
Srimad Bhagavatam 3.29.11-12,
Devotional service begins with the chanting of the Hare Krishna mantra and side by side trying to understand Krishna in truth.
Bhagavad Gita 9.20,
Devotional service to the Lord is not an activity of this material world; it is part of the spiritual world, where eternity, bliss and knowledge predominate.
Without devotional service, all other methods for spiritual self-realization are weak and insignificant. Unless one comes to the devotional service of Lord Krishna, jnana yoga cannot give the desired results.