注大乘入楞伽經 1.175

1.175

問：五明法及世間伎能，誰之所作？五明論者：一名內論，一切佛法是也。二名外論，有四種：謂因論、聲論、醫方論、工巧論。此五各能生智，故云明處。

This asks: By whom are the five fields of knowledge and worldly skills created? As for treatises on the five fields of knowledge: The first is called the inner treatise, which is all the Buddha-dharma. The second is called external treatises, of which there are four kinds: treatises on logic, treatises on linguistics, treatises on medicine, and treatises on the arts and crafts. Because each of these five can generate wisdom, they are called fields of knowledge.