Zen is a practice of Buddhism. Buddhism is a way of liberation. By cultivating the mind, people can get rid of troubles and pains. It is this kind of mind that Zen cultivates. The doctrine of Buddhism is the doctrine of education, which educates everyone to know good and evil and cause and effect, so that people can break evil and cultivate good, and get rid of the troubles and pains of bad karma. Buddha's education has gone beyond the scope of religion and philosophy.