Endurance

Both Heaven and Earth endure forever.
The cause of their endurance
      is their indifference.
                                  --- Lao Tzu

"Heaven" and "Earth" however, are part of the created worlds, which are not forever. That they endure is the will of the Creator as they evolve within their own limited systems, affected by their particular systems'  laws. How long will they endure? -- I don't know, nor does anyone know, but the One Who set these worlds in motion.