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Inward activity. The essence of a being to act from within; ranging from the life of God, which is identical with his nature, on through all the forms of life in the created universe. The higher a nature the more intimate what comes from it, for its inwardness of activity corresponds to its rank of being. Life is immanent activity, which begins and terminates within the living being.
All items in this dictionary are from Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.