Lavelle on Living in the Present

Louis Lavelle (1883-1951), The Dilemma of Narcissus, tr. W. T.  Gairdner (New York: Humanities Press, 1973), p. 153:

Life breaks the surface of reality and emerges at the present moment; we must not hold our gaze fixed on a future which, when it comes, will be merely another present. The unhappy man is he who is  forever thinking back into the past or forward into the future; the happy man does not try to escape from the present, but rather to penetrate within it and take possession of it. Almost always we ask of the future to bring us a happiness which, if it came, we would have to enjoy in another present; but this is to see the problem the wrong way round. For it is out of the present which we have already, and from the way we make use of it, without turning our eyes to right or to left, that will emerge the only happy future we will ever have.