The Denkōroku, "The Record of the Transmission of the Light", written by Keizan Jōkin 瑩山紹瑾 (1268-1325), is an example of the "Transmission of the Lamp"-genre.
Hakuin gives this description of his first kensho, when he was 21: At around midnight on the seventh and final night of my practice, the boom of a bell from a distant temple reached my ears: suddenly, my my body and mind dropped completely away.