The question, "What desirest thou?" really can reveal who we are and where we are headed. If we can truthfully look at our desires and honestly prioritize them, we can know where we are going. Maybe it's easiest to evaluate our desire based on our actions. Because what we do is a physical evidence of what we want.
If I say I want to become a great pianist, and spend my days watching television, then obviously my desire to be a pianist isn't very strong. Our actions and our desires have to be aligned for us to progress.
The general conference talk from April 2011 by Lynn G. Robbins discusses this idea. He talks about DO and BE and says in order to BE the person we want to be, we must DO the things to get us there. We may pretend to BE a righteous person, but in secret we are DOING things we shouldn't be doing. Or we may DO good things to be seen of men, but have wicked motives. Which brings me back to desires.
In my times of contemplation, of worship, of prayer, I truly desire to be the best daughter of my Heavenly Father that I can be. But then life interferes and I may slight my scripture study, or ignore a prompting to call my neighbor, or snap at my husband. However, if I focus on my righteous desires, I will prioritize scripture study, try harder to listen to the Spirit, attend the temple and apologize to my husband. My desires will be fulfilled as my righteous actions lead me closer to my Father in Heaven.