The Giving Pillar is a pillar of the mind because it takes the mind off "self". Selfishness and self-centeredness are the root of all our problems. When we take our minds off  ourselves and focus on serving God and others, not only are we happier, but it opens our minds to a whole new world we never thought possible. The Mind is God"s Gift to us. He gave us the power of the mind to create a life of happiness, fulfillment, peace, love, joy, and prosperity and Giving is such a big part to unlocking that kind of life.