Considering this reality, nothing is truly free. Even the most generous gifts, help, and kindness cost someone’s effort, love, time, generosity, and energy. So we should at least try to repay our debts in some way. Every man’s doings, which provide physical or mental value to humanity or Gaia itself, have their own cost. The energy and time of every man in his work have value. We humans have been trying for centuries to define this value of energy in terms of money. Certainly, this representation has its own flaws, but it’s the best functioning system we know about today.