February is the perfect backdrop to explore C. S. Lewis's 1960's book, The Four Loves, in which he unpacks his robust interpretation of four types of loves: philia, storge, eros and agape. Today we will speak with Lewis experts David and Crystal Downing of Wheaton College on the subject of philia - friendship bonds. Lewis described philia as the "least of the natural bonds" but potentially the most powerful because it is freely chosen. He believes friendship is the "crown of life" and in today's modern world, we ignore its positive influence on human happiness at our peril.