If you employ your physical body to reach this ultimate union, we call this karma yoga, or the yoga of action. If you employ your intelligence to reach your ultimate nature, we call this gnana yoga, the yoga of intelligence. If you employ your emotions to reach your ultimate nature, we call this bhakti yoga, the yoga of devotion. And if you use your energies to reach the supreme experience, we call this kriya yoga, the yoga of transforming energies.