Pratyahara (Withdrawal of Senses), Dharana (Concentration), Dhyana (Meditation)
As we reflect constantly through the asana and pranayama practices and allow the body and mind to open up and feel more at ease, we are ready to sit still and observe ourselves more closely. By sitting still and looking inward, observing the mind and its activity, we begin to see our thinking and reacting patterns, our strong fixed ideas of right and wrong, and how all these are causing us to live as very restricted and limited versions of ourselves.
We learn to drop all things that drain our energy unnecessarily, thereby reducing our impulsive reactions to external stimuli and our judgements of ourselves and others. The idea of a separate "I" whose life story is the center of our existence starts dissolving. We become more open to life, more clear in thinking and doing whatever fosters oneness; not separation.
In the state of complete absorption, even the idea of this body and mind we have, the world around us, nature, God, oneness, all disappear. There is no one seeking/seeing oneness, nothing/no one to feel one with. That state of absorption can give us a glimpse of the one absolute reality.