佛說觀佛三昧海經 2.31

2.31

「佛坐此坐，消除三障成菩提道，佛心境界說不可盡，若廣說者，一切眾生至十地菩薩，亦不能知亦非所解。是故於此白毫相中，隱而不說。

“Sitting upon this seat, the Buddha eliminated the three hindrances and completed the path to bodhi. The realm of the Buddha’s mind cannot be exhaustively spoken of; were it to be explained at length, not a single sentient being, up to even the bodhisattvas of the tenth ground, could know or comprehend it. Therefore, within this mark of the white ūrṇā, it is kept concealed and not spoken.