All of creation works according to natural laws which are a reflection of spiritual law. Additionally, it is the basis for the Wiccan Rede and the Threefold Law. The Threefold Rule is an extrapolation of the Karmic law that the energy that we send out returns to us. A powerful incentive to do good works, I think. See Living Principles for additional discussion of the Wiccan Rede and the Threefold Law.
Nature is the great teacher.
Because all of creation works according to natural law, which is a reflection of spiritual law, observing, interacting with, and respecting Nature are the best methods for learning to connect with the Divine Spark within ourselves and all beings. The goal of Wiccan practice is Union with God, Goddess, and Spirit. This is achieved by living according to the Wiccan Rede, the Threefold Law, and natural laws. Wiccan Gods and Goddesses are considered to be benevolent beings, but the key to achieving union with the Higher Self, the the Gods, and the Goddesses is personal responsibility. We choose how we live.