摩訶止觀 3.9

3.9

貫穿義者，智慧利用，穿滅煩惱。《大經》云：「利钁斵地，磐石、砂礫，直至金剛。」《法華》云：「穿鑿高原猶見乾燥土，施功不已，遂漸至泥。」此就所破得名，立貫穿觀也。

As for the meaning of piercing through: wisdom takes effect and pierces through to destroy defilements. The Great Sūtra says: 'A sharp hoe digs into the ground through boulders and gravel, straight down to the diamond.' The Lotus Sūtra says: 'Digging into a high plateau, one still sees dry earth; applying effort without cease, one gradually reaches mud.' This receives its name from that which is destroyed; this establishes the contemplation of piercing through.