John Gardner's books and essays on "Self-Renewal" have become classics and I for one hope they discover a whole new market among today's Millennials who are looking for meaning purpose and using their lives for something outside themselves.  Several times he cautions against becoming so good at something that we let other parts of ourselves atrophy and we "go to seed" because we have so focused on one area of our lives.  "Life is an endless unfolding and if we wish it to be an endless process of self-discovery an endless and unpredictable dialogue between our own potentialities and the life situations in which we find ourselves. By potentialities…