長阿含經 9.p75

9.p75

“There are another four things, which are the four dhyānas: Here, a monk rids himself of desire and bad and unskillful things. With perception and examination, this seclusion gives rise to joy and happiness, and he enters the first dhyāna. He ceases having perception and examination. With inner belief and unified mind, he has no perception or examination. His samādhi gives rise to joy and happiness, and he enters the second dhyāna. Parting with joy, he cultivates equanimity, mindfulness, and effort, knowing his own happiness is what’s sought by the noble ones. Mindful, detached, and happy, he enters the third dhyāna. Parting with painful and pleasant formations, his previous sorrow and joy ceases. Neither discomforted nor happy, he’s detached, mindful, and pure, and he enters the fourth dhyāna.