金剛經纂要刊定記 4.167

4.167

正解無倒者。既有正解必無倒惑，以解因果無相道理，名為實信，即慧學也。

Regarding "correct understanding without inversion": once there is correct understanding, there must be no inverted delusion. Understanding the principle that cause and fruit are without marks is called true faith, which is the training in wisdom.