St. Thomas recovered the Aristotle’s metaphysics, as a tool to deepen the faith.
Reason was thus presented as a natural sense to usefully direct the will and the eternal law was identified with the reason of divine wisdom that moves everything to the due end.
God loves and takes care of all creation giving physical laws as well, eternal laws that can be known by reason and that indicate right free actions.
Under natural law man is called to provide for himself and others with humble, reasonable and responsible care, counteracting pathological and passionate habits and dispositions, to judge and choose with the intellect, so that action could be dominated by will.
When the will follows God’s guidance with His gifts, man works with perfection, without damaging the nature, he has received, which is indeed perfect; so he persists as the principle of his acts through God’s gifts, as virtuous habits that, in respect of free will, make congruent the human action to God's plan, retaining responsibility and awareness, renewing us in the mystery of God's infinite love.