大般涅槃經義記 3.158

3.158

自下第三領解讚嘆。「善哉」嘆辭。餘言領解，「說真我受」法說領解，「如金剛」等喻說領解。

From here on is the third part: expressing understanding and praising. "Excellent!" is an expression of praise. The remaining words express understanding: "Expounding the true self, I accept it" is expressing understanding in terms of dharma; "like a vajra" and so forth is expressing understanding in terms of simile.