俱舍論頌疏論本 4.58

4.58

釋曰：尋伺心麁細者，尋謂尋求，伺謂伺察。心之麁性名之為尋，心之細性名之為伺。復有別釋：尋、伺二法是諸語言行。故契經言：「要有尋伺，方有語言，非無尋伺此語言行。」麁者名尋，細者名伺。語言行者，是語言因也。

The commentary explains: Regarding "Investigation and scrutiny are grossness and subtlety of mind": investigation (vitarka) means seeking; scrutiny (vicāra) means examining. The gross nature of the mind is called investigation; the subtle nature of the mind is called scrutiny. There is another explanation: the two factors of investigation and scrutiny are the formations of speech. Thus the sūtra states: 'There must be investigation and scrutiny before there can be speech; without investigation and scrutiny there are no such formations of speech.' The gross is called investigation, and the subtle is called scrutiny. 'Formations of speech' means the causes of speech.