Buddhacarita by Ven Asvaghosa - Ancient Buddhist Texts

Buddha-carita, or Life of Buddha - 178
is that which is the necessary condition for the attachment to
existence’
41. Having ascertained this to be desire, he again meditated, and he
next pondered, ‘What is that which is the necessary condition for
desire’
42. He saw that desire arises where there is sensation, and he next
pondered, ‘What is that which is the necessary condition for
sensation’
43. He saw that sensation arises where there is contact, and he next
pondered, ‘What is that which is the necessary condition for contact’
44. He saw that contact arises through the six organs of sense; he then
pondered, ‘Where do the six organs of sense arise’
45. He reflected that these arise in the organism, he then pondered,
‘Where does the organism arise’
46. He saw that the organism arises where there is incipient
consciousness; he then pondered, ‘Where does incipient consciousness
arise’
47. He reflected that incipient consciousness arises where there are the
latent impressions left by former actions; and he next pondered,
‘Where do the latent impressions arise’