大方廣佛華嚴經隨疏演義鈔 61.28

61.28

疏「尋伺心麁細」者，即是〈界品〉。釋曰：尋為尋求，伺為伺察。心之麁性名之為尋，心之細性名之為伺。

Regarding the commentary's phrase "investigation and scrutiny are the coarseness and subtlety of mind": this is from the "Chapter on the Realms." Explanation: Investigation (vitarka) is seeking out; scrutiny (vicāra) is discerning examination. The coarse nature of mind is called investigation; the subtle nature of mind is called scrutiny.