What is Spiritual Power?
Generally, the power of spirituality is something that is known through experience. It is hard to describe spiritual power to someone who does not have personal experience of it. Spiritual power is very subtle. If you do not have experience with it, it is very hard to understand it.
However, I can say there are various ways spiritual power develops in a person. It is acquired by way of practice, by way of study, and through various other means depending on the inclination of the individual. But the most effective way of encounter spiritual power is through meditation practice.