The aim was to deepen the understanding and the knowledge of the concepts and phenomena of power and authority from the standpoint of caring science. An ontological determination of the character of the concepts is carried out where a hermeneutic interpretation is made of texts in the Old and the New Testaments in the Bible. The findings show how a human being's power is the authority to hold every living thing in trust, to tend to and care for life. Serving one's fellow-being is the purpose for anyone using this authority.