坐禪三昧經 2.13

2.13

或有行者！先從初地乃至上地，復於上地習行慈心，先自得樂破瞋恚毒，次及十方無量眾生。是時便得慈心三昧。悲心憐愍眾生之苦，能破眾惱，廣及無量眾生。是時便得悲心三昧。能破不悅，令無量眾生皆得喜悅。是時便得喜心三昧。能破苦樂，直觀十方無量眾生，是時便得護心三昧。二禪亦復如是，三禪四禪除喜。

Or there is a practitioner who first proceeds from the initial plane up to the higher planes, and further on the higher planes practices loving-kindness: first attaining bliss himself, he shatters the poison of anger, and next extends it to boundless sentient beings in the ten directions. At that time, he attains the maitrī samādhi. With a mind of compassion pitying the suffering of sentient beings, he can destroy numerous afflictions, extending broadly to boundless sentient beings. At that time, he attains the karuṇā samādhi. Able to destroy displeasure, he causes boundless sentient beings to all attain joy and delight. At that time, he attains the muditā samādhi. Able to destroy suffering and pleasure, he directly contemplates boundless sentient beings in the ten directions; at that time, he attains the upekṣā samādhi. The second dhyāna is also like this; the third and fourth dhyānas exclude joy.