Hakuin Ekaku is a famous Japanese Zen Buddhist priest. He lived from 1686 to 1768 and is known for his teachings about meditation and enlightenment. He wrote many books about Zen Buddhism and helped to spread the teachings of Zen across Japan and the world. Hakuin believed that everyone had the potential to reach a state of enlightenment through meditation and by living a life of service to others. He encouraged people to practice compassionate kindness and heroic effort to help them on the path to enlightenment.