Living in the present requires that we maintain an eternal perspective. If we do not - if instead we live with our eyes focus on the here and now, then we will live a life doomed to meaninglessness and frustration. In Ecclesiastes 6:10 - 12 the preacher reminds us  of the need and value of rightly evaluating the length of our life and the depth of our impact so that we spend our energy and time in a fruitful and productive endeavor.