tathā hi yatkādācitkaṃ tadahetukaṃ niścitaṃ yathā kaṇṭakataikṣṇyādi kādācitkaṃ ca duḥkhādīnīti svabhāvahetuḥ /
For whatever occurs only occasionally is definitely without cause - like the sharpness of thorns and such things; and pain and other [internal things] occur only occasionally - this is an inference based on essential nature.