Charak Samhita
तस्योपलब्धिर्निदानपूर्वरूपलिङ्गोपशयसम्प्राप्तितः ॥6 ॥
॥ Means for knowledge of disease॥ Diseases could be diagnosed by studying their nidana (etiology), poorvarupa (premonitory symptoms), linga (sign and symptoms), upashaya (pacifying factors) and samprapti (pathogenesis).
english translation
tasyopalabdhirnidAnapUrvarUpaliGgopazayasamprAptitaH ॥6 ॥
hk transliteration by Sanscript