LIGHT, the primeval, pure, almighty energy, is the brightest as well as darkest riddle that puzzles all earthlings for millennia. Whoever truly knows light has already cracked the greatest mystery of the cosmos. Alas, what a surprise! This riddle has been actually cracked independently by three thinkers of different ages. Heraclitus, the Hellenic thinker 2500 years ago, is the first cracker of the riddle with his doctrines that things are constantly changing (universal flux), that opposites coincide, and that Fire is the source and nature of all things-Just translate his fire into LIGHT. 2500 years later, there comes the second cracker Nikola Tesla, the modern Heraclitus, who, in 1899, explicitly declares that Everything is Light, or Energy, or Electricity. Solatle Lu is the third cracker, the first expositor of the riddle. He explicitly declares that All particles are derived from photons and live forever in 2019 in his An Outline of Force Cosmology, substantially honors LIGHT as the Creator of all things in his CFC, thus develops the common belief of the three to the Highest Knowledge of the 21st century, the First Principle. This event marks a great leap in the continuous rational movement of mankind.