Reiki's founder Mikao Usui created five Reiki principles: "Just for today, do not worry. Do not anger. Be Kind. Work honestly. Be grateful." The first principle focuses on living in the moment and letting go of dwelling on the future and the past to reduce feelings of anxiety, regret, and tension. Do not anger, the second principle, acts as a reminder to feel anger, learn from it, and let it go — holding onto anger can block energy and cause health issues. Respecting the differences between all living things, as the third principle prompts us to do, encourages compassion. The fourth principle concentrates on maintaining integrity in your work, which helps build trust. And lastly, being grateful allows you to appreciate everything in your life, including your problems, because they may aid spiritual and emotional growth. Meditating on these principles can help release energy blockages that may hinder Reiki's flow, and they can help lead to better emotional, spiritual, and physical health.