淨名經集解關中疏 1.38

1.38

深信堅固猶若金剛　二釋名高所以由信固也。肇曰。七住已上無生信不壞也。

“Their deep faith firm and secure, like vajra”: Second, explaining that the reason for their lofty fame is their firm faith. Zhao says: “From the seventh stage upward, their faith in non-arising is indestructible.”