Based on Bhagavad Gita Chapter 02, Text 41
Nothing glorious can be achieved without single-pointed, sustained determination. The Bhagavad-gita (2.41) indicates that determination (drdha-vratah) is essential for the most glorious achievement of life: reviving our love for Krishna and thereby relishing eternal happiness. In fact, while attaining love for Krishna, our determination is the first thing, the main thing and the only thing:
The first thing: Our spiritual journey begins with our determination. Devotees can come in our life and invite, even prod, us along, but our journey actually starts only when we desire determinedly to go closer to Krishna.
The main thing: When we start practicing devotional service regularly, the external performance of spiritual activities does not automatically lead to our advancement; it adds to our spiritual credits and thereby sets a platform for eventual devotional takeoff. We actually take off only when our external engagement is accompanied, even motivated, by our internal desire to love and serve Krishna — which is a function of our determination.
Read More – http://www.gitadaily.com/2012/07/14/the-first-thing-the-main-thing-the-only-thing/