Spiritual Reflections: When the Gospel of John contrasts walking in the day to walking at night, we know it refers to more than getting home before curfew.
Of what are you afraid? It might be snakes, bankruptcy or things that go bump in the night. Whatever you name, it's ultimately a fear of death and her little sisters, pain and diminishment.
Even if we can't explain it, most of us are aware that Einstein's theory of relativity threw a monkey wrench into Newton's "modern" physics. What we may not have thought about is the devastating effect the theory has on the individualism that characterizes modern philosophy.