Ashtangasamgraha 22.8

22.8

sarvabhāvānāṃ bhāvābhāvau nāntareṇa yogātiyogādīn vyavasyet |

sarveṣāṃ punarvikārāṇāṃ nidānadoṣadūṣyāviśeṣebhyo bhāvābhāvaviśeṣā bhavanti |

yadā hyete trayo nidānādiviśeṣāt nānyonyamanubadhnantīṣadvānubadhnantyabalā vā na tadāminirvarttante vyādharyāścarā dvābhinirvarttante tanavo vā bhavantyasampūrṇaliṅgā vā |

viparyaye tu viparītāḥ ||

One should determine the presence or absence of all states not apart from proper conjunction, excessive conjunction, and the rest.

Moreover, the specific presence or absence of all disorders arises from the particular combination of etiology, doṣas, and susceptible tissues.

For when these three do not combine with one another, or combine only slightly, or are weak, due to the particularities of the etiology and so forth, then diseases do not manifest, or they manifest late, or they are mild, or their symptoms are incomplete.

In the opposite case, however, the results are contrary.