Charak Samhita
ते पूर्वं केवला रोगाः पश्चाद्धेत्वर्थकारिणः । उभयार्थकरा दृष्टास्तथैवैकार्थकारिणः [१] ॥२०॥
Conditions in their primary stages or forms manifest themselves as diseases and subsequently act as causative factors for other diseases. They thus play a dual role - as a disease and as a causative factor. Some of these play just one role as well– either as a disease or as a causative factor.
english translation
te pUrvaM kevalA rogAH pazcAddhetvarthakAriNaH । ubhayArthakarA dRSTAstathaivaikArthakAriNaH [1] ॥20॥
hk transliteration by Sanscript