Charak Samhita
कार्ययोनिस्तुसायाविक्रियमाणाकार्यत्वमापद्यते ॥७१॥
[Karyayoni (source)] Karyayoni is that which (intimate cause) is converted into action (karya) after transformation.
english translation
kAryayonistusAyAvikriyamANAkAryatvamApadyate ॥71॥
hk transliteration by Sanscript