We can never differentiate between soul and energy as both mean the same. The soul existing in human body is the Prana, cosmic energy that manifested human form to work out its karma, remove dross impurities within. This cosmic energy manifests human form as of itself it could not purify self. To cleanse itself of dross impurities within it needs a medium, a body.
The soul, Prana energy existing in human beings is the ultimate master and controller of human life. In absence of soul, Prana energy the human body could not sustain of its own, would decay and die. Ever since a soul manifest human form it desires liberating from cycle of birth and death at the earliest, regain its lost original pure prime pristine primordial form.
Indulging in spirituality when seekers finally reached state of enlightenment it announced the soul atman within gaining absolute purity forever. The liberated soul atman finally becomes free from bondage of solar system. It can now venture freely to any part of cosmos at will.
In substance, as per doctrine of Advaita Vedanta propagated by Adi Shankaracharya, other than world of souls nothing existed in cosmos. Brahman, God Almighty is the only truth of life. Brahman, the collective power of all souls in cosmos in their pure form! Brahman is that cosmic energy big bang explosion of which resulted in creation of present cosmos.
If we are 100% truthful and also demolish our ego in totality by indulging in spirituality, we can feel presence of soul, this minute cosmic energy all the time in our heart.
From a spiritual angle soul, atman, Prana and consciousness, the subtle cosmic energy present in heart all meant the same.