Suba,
Our senses are designed to absorb a limited range of signals and we condition our brain to churn out a very glossed over, uncomplicated, approximate world-view so that we can glide through the chores of living unscathed. We realize how unreal all this is only when the apparent is questioned.
What is stability? Are we talking about "oneself’’ as an object that is stable? Does that mean unmoving? unchanging?
All objects of matter have life, the cosmic energy that is ever vibrant through waves, movement, rhythm and change. That is in real state. Can we perceive this state ‘as is’? No, not until we learn to break away from the compulsions of sense-based cognition.
A simple example is, when we fly. The initial push and pull during take off, soon goes away and we feel ‘stability’ when we are actually flying exactly as fast as the aircraft. Are we really stable?
When we look at a plant, each time we see it as ‘stable’ though the transformative process of seed to fruition to flowering to drying to new seeds is continuous. Our own aging is continuous, in living we die, in dying we re-live.
So stability in Yoga is -
1/ one of recognizing the rhythm and movement in breathing, emoting and sensing,
2/ gauging the spikes, irregularities and captivity of automatic reflexes
3/ learning and practicing the ideal or natural rhythm
4/ consciously aligning own rhythm with the natural one and stay that way
This alignment brings perceived and real stability and is to be achieved for the body through asanas and breathing, for the mind through yama-niyama to enter the domain of soul with pratyahara and progressively through dharana, dhyana and Samadhi to be inherently aligned needing no effort.
Stability is a long process and balance is crucial in the initial stages for alignment. But one legitimate question is - how does one know the natural rhythm and the fact that one is aligned therewith? The missing key is awareness. In all our efforts to balance and align we travel through the thickness of gross into the fineness of the subtle. As the body is purified, wild emotions are tamed and reasoning becomes discerning, awareness rises from gross to subtle. One also develops the proverbial ‘sixth sense’ to which the ‘stability’ is simply known when achieved.