Avatar: The Last Airbender2005

Uncle Iroh:
There is energy all around us. The energy is both yin and yang; positive energy and negative energy. [He holds up one finger on each hand to stand for the two forms of energy] . Only a select few firebenders can separate these energies. This creates an imbalance. The energy wants to restore balance and in a moment the positive and negative energy come crashing back together. [He brings his hands together to illustrate the point] You provide release and guidance, creating lightning. [Shows Zuko]

Prince Zuko:
I'm ready to try it!

Uncle Iroh:
Remember, once you separate the energy, you do not command it. You are simply its humble guide. Breathe first.