Based on Bhagavad Gita Chapter 08, Text 14
In an elevator, what gets us to the destination quickly is the motion of the elevator, not our emotion during the elevation.
Bhakti-yoga is like an elevator that takes us to the topmost summit of spirituality. It can grant us smoothly and swiftly, as the Bhagavad-gita (08.14: sulabhah) indicates, realization of Krishna, the highest manifestation of the Absolute Truth.
A physical elevator is powered by mechanical function, but the bhakti elevator is powered by devotional intention. The more our eagerness to attain Krishna and the more we express that eagerness by diligently practicing devotional service, the faster moves the bhakti elevator.
Someone may object, “Isn’t Krishna attained only by his grace?” Yes, certainly. But he is always ready to bestow his grace. What makes his ever-available grace accessible to us is our intention. So in that sense the velocity of the bhakti elevator is determined by the strength of our intention.