南宗頓教最上大乘摩訶般若波羅蜜經六祖惠能大師於韶州大梵寺施法壇經 1.86

1.86

和尚本是韶州曲江縣人也。如來入涅槃，法教流東土，共傳無住心，即我心無住。此真菩薩說，真實亦譬喻，唯教大智人，無住是旨依。凡發誓修行，修行遭難不退，遇苦能忍，福德深厚，方授此法。如根性不堪，裁量不得，雖求此法，建立不得者，不得妄付《壇經》。告諸同道者，令知密意。

The venerable master was originally a man of Qujiang County in Shaozhou. The Tathāgata entered nirvāṇa, and the Dharma teaching flowed to the eastern land; together they transmitted the non-abiding mind, which is our mind's non-abiding. This is what true bodhisattvas teach, both real and metaphorical; teaching only people of great wisdom, non-abiding is the tenet's reliance. Only when one takes vows to cultivate, encounters hardships in cultivation without retreating, can endure suffering, and has profound merit and virtue, should one be granted this Dharma. If one's faculty and nature are inadequate, unable to measure it, and though seeking this Dharma one cannot establish it, one must not rashly entrust the Platform Sūtra to them. I announce this to all fellow followers of the path, so that they may know the esoteric meaning.