Visuddhimagga XVII-30

 Yathā pana tesu purisesu eko valliyā majjhaṃ paṭhamaṃ passati, so majjhe chinditvā uparibhāgaññeva ākaḍḍhitvā ādāya kamme upaneti, evaṃ bhagavā ‘‘tassa taṃ vedanaṃ abhinandato abhivadato ajjhosāya tiṭṭhato uppajjati nandī. Yā vedanāsu nandī, tadupādānaṃ. Tassupādānapaccayā bhavo, bhavapaccayā jātī’’ti (ma. ni. 1.409; saṃ. ni. 3.5) majjhato paṭṭhāya yāva pariyosānāpi deseti.

（2）譬如彼等四人之中，一人先看见蔓的中部，他便割断中部，只拉其上部，取而使用。世尊亦这样从中间开始而至最后说：「对于他的受而欢喜而欢迎而耽著者生起喜，那于受中的喜是取。以取为缘的是有。以有为缘的是生」。

Ñ(XVII,30): (ii) Just as another of the four men sees the middle of the creeper first, and after cutting it in the middle, he pulls out only the upper part and takes it away and uses it, so the Blessed One teaches it from the middle up to the end thus: 'When he is delighted with, welcomes, remains committed to that feeling, then delight arises in him. Delight in feelings is clinging. With his clinging as condition there is becoming; with becoming as condition, birth' (M.i,266).