When we think about spirit that spirit is referring to invisible soul. Spirit in other word is invisible active energy of universal force. Every creature's physical forms are active due to presence of soul or spirit. It's like catalytic agent. Like oxygen. That remains unaffected during any action. A person, who wants to turn spiritual, should try to introvert his energy through meditation. One should change the mind from material gains by observing your own thoughts without chasing thoughts. Spirituality is self-realization.