This is a doctrine of the Tendai Sect which divides into three stages the process from the sowing of the seeds of Buddhahood in people's field of the mind by Buddha to Gedatsu (being liberated from earthly desires and the woes of man).
仏が衆生の心田（しんでん）に成仏の種を蒔いてから解脱するまでの順序を3つに分類した天台宗の教義である。