Hakuin's short text on kensho, "Four Ways of Knowing of an Awakened Person," is a little-known Zen classic. The "four ways" he describes include the way of knowing of the Great Perfect Mirror, the way of knowing equality, the way of knowing by differentiation, and the way of the perfection of action. Rather than simply being methods for "checking" for enlightenment in oneself, these ways ultimately exemplify Zen practice. Albert Low has provided careful, line-by-line commentary for the text that illuminates its profound wisdom and makes it an inspiration for deeper spiritual practice.