增壹阿含經 12.1.p17

12.1.p17

“How does a monk contemplate internal feeling as feeling? Here, when he has a pleasant feeling, a monk realizes, ‘I’m having a pleasant feeling.’ When he has a painful feeling, he realizes, ‘I’m having a painful feeling.’ When he has a feeling that’s neither pleasant nor painful, he realizes, ‘I’m having a feeling that’s neither pleasant nor painful.’