" This explains why habits are so powerful: They create neurological cravings. Most of the time, these cravings emerge so gradually that we’re not really aware they exist, so we’re often blind to their influence. But as we associate cues with certain rewards, a subconscious craving emerges in our brains that starts the habit loop spinning. "

― Charles Duhigg , The Power of Habit: Why We Do What We Do in Life and Business