摩訶止觀 5.192

5.192

經云：「不生不可說，以有得故。」今解：此破不思議解及界內之解亦是修道得故；界外之解亦是修道得故。得即詣理，理絕心口，故不可說也。佛以六句破諸法解惑，皆言不可說，彌顯無生門破法遍也。

The sūtra says: "Non-arising is ineffable, because there is attainment." It is now explained: this breaks inconceivable understanding as well as understanding within the realms, because it too is attained through cultivating the path; understanding outside the realms is also attained through cultivating the path. Attainment means reaching the principle, and the principle transcends mind and mouth; therefore it is ineffable. The Buddha uses six phrases to break understanding and afflictions regarding all dharmas, stating in all cases that they are ineffable, which further manifests how the gate of non-arising breaks phenomena completely.