We cannot learn through asanas

We cannot learn or cleanse our mind through asanas. By introspection alone can this be achieved. Asanas can develop body awareness honed to a fine degree but obviously it ends there. Our petty qualities, our ego etc cannot change unless we intend to make a change and this intention does not need asanas. Hence the need for introspection to remove weeds. Its very simple- body has to be kept healthy by exercise and our thoughts to be stilled by pyscho-spiritual processes which primarily is turning inward. It is still appropriate to say that Hatha Yoga is only for the body and not the mind. Imagine an asana removing our bad qualities- over night we can then purify the planet. It is very difficult for the vasanas to change and hence constant introspection is needed.