坐禪三昧經 2.25

2.25

若行者得法念止，厭世間空老病死法，都無少許常樂我淨，我於此空法復何所求？應當入涅槃最善法中住。建精進力，得深舍摩陀故（深舍摩陀者，住心一處名也，此土無是名）。是時得深舍摩陀，住第四法念止中，觀諸法相，皆苦無樂，無樂是實，餘者妄語。苦因愛等諸煩惱及業，是非天、非時、非塵等種種妄語中生，是煩惱及業出生，此苦是苦。

If the practitioner attains mindfulness of dharmas, they become weary of the worldly dharmas of emptiness, old age, sickness, and death: there is not the slightest permanence, bliss, self, or purity. What more should I seek in these empty dharmas? I should enter and abide within the supreme good dharma of nirvāṇa. Establishing the power of vīrya, because one attains deep śamatha (deep śamatha is the name for fixing the mind in one place; this land has no such term). At that time, attaining deep śamatha and abiding in the fourth application of mindfulness of dharmas, one contemplates the marks of all dharmas as all duḥkha and without pleasure. 'Without pleasure' is real; the rest is false speech. Suffering has as its causes craving and other kleśas as well as karma; it is not born from various falsehoods such as God, Time, or Pradhāna. Kleśas and karma give birth to it; this suffering is truly suffering.