An old man says to his grandson: ‘There’s a fight going on inside me. It’s a terrible fight between two wolves. One is evil–angry, greedy, jealous, arrogant, and cowardly. The other is good–peaceful, loving, modest, generous, honest, and trustworthy. These two wolves are also fighting within you, and inside every other person too.’

After a moment, the boy asks, ‘Which wolf will win?’

The old man smiles. ‘The one you feed.’

Rutger Brennan, Humankind: A Hopeful History