If our ordinary, self-centered viewpoint is dominant, rocks and tree roots are undesirable. But if we change our point of view, then the very fact that there are rocks and tree roots makes the valley stream more beautiful and the sight of waves breaking upon them beyond description. When we perceive joy, anger, happiness and sorrow as enriching our lives, just as rocks and tree roots and water spray embellish nature, then we are able to accept whatever happens and live like flowing water, without clinging to anything.
Time and space are the very music of God's harp, for each moment in time is empty of other moments, and each part of space is empty of other parts, so that we will not have to hear too much at once. That is why there are seasons.