All true morality, inward and outward, is comprehended in love, for love is the foundation of all the commandments.
All outward morality must be built upon this basis, not on self-interest. As long as man loves something else than God, or outside God, he is not free, because he has not love. Therefore there is no inner freedom which does not manifest itself in works of love. True freedom is the government of nature in and outside man through God; freedom is essential existence unaffected by creatures. But love often begins with fear; fear is the approach to love: fear is like the awl which draws the shoemaker's thread through the leather.

Sermon VII : Outward and Inward Morality - Meister Eckhart's Sermons (1909)