佛說觀佛三昧海經 1.39

1.39

"Thus, Royal Father, after my parinirvāṇa, sentient beings will have various karmic deeds, various thoughts and imaginations, and diverse perceptions. In accordance with what those sentient beings see through their mind's thoughts, one should teach them sequentially to bind their thoughts. While I dwell in the world, there is no need to bind one's thoughts. It is like the rising of the sun: all that is dark becomes bright, except for the blind, who see nothing.