Hi Interpaul,
The question you ask is very similar to one that came up on the last residential AYP retreat in England.
Basically someone has to want something in order to take up spiritual practices in the first place. They have to want more peace, or more joy, or more love, or a better understanding of the divine and so on, in order to take up a spiritual practice in the first place. So, some degree of desire has to be there. And the object of this desire can then change as their practice develops.
It is actually a good thing if this desire increases over time becoming all consuming at some stage. It may not become all consuming for everyone but it is a good thing if it does.
At the same time we need to be cultivating non-attachment to the fruits of our practice whilst simultaneously cultivating a strong desire for those fruits. This is one of the divine paradoxes of the path of yoga.
Gradually, over the years, our desire, or ideal, will tend towards liberation, unity and divine love. This happens as a natural result of the purification of the subtle nervous system.
However, we cannot spend our entire spiritual life longing for something we do not have. So, in order to complete the journey, we have to let go of all spiritual desire by becoming our Ishta. We have to eventually become peace, and joy, and freedom and unconditional love. Then we no longer need to yearn for it because we are it. The practices of self inquiry help with this process. The affirmations of “I am joy”, “I am love”, “I am peace”, “I am freedom” etc. will naturally lead us towards this state. Even the self inquiry practices involving negation lead us to this state by systematically removing everything that we are not.
The timing of this is important. If someone lets go of desire for their highest ideal too soon, then they can fall backwards on the path, or even fall off the path all together. If they hold on for too long then they will remain in separation for longer than necessary. Some of the dualistic schools of yoga recommend remaining in a state of separation indefinitely. So, the object of our desire always remains “other” and separate from who we are. By doing this they avoid the pitfall of ending desire for our Ishta too soon and falling off the path. Then, when someone is ready, they will come to know themselves as That which is beyond all conditioned existence anyway, without any deliberate attempt to bring that realisation about. However non-dualistic schools of yoga use practices to deliberately help bring that realisation about. They trust (or hope) that people will not attempt to take on these practices too soon. For the most part it works. 