Spiritual significance of Marriage
Marriage means uniting two principles; i.e. the principles of Deity Shiva in the form of the husband and the principle of Goddess Pārvati as His wife. Deity Shiva represents the Will for an action and Goddess Pārvati represents Divine Energy. For the successful completion of any action both aspects are required, i.e. the Will for the action and the energy to actually perform it. The Will in the form of Deity Shiva is unmanifest, but it comes alive when it is charged with Divine Energy, which manifests bringing the action to completion.
Courtesy: Forum for Hindu Awakening