首楞嚴義疏注經 2.73

2.73

竪手為倒却以為正，以不順身故此為倒。阿難不辨真妄，執妄失真，故如來責顛倒行事。既了妄本無體，合知真自寂然，遂許對頭動之見、觀河之性即是性真，無別真也。慶喜依前不了，將謂妄外有真，遂不甘我為顛倒之人、王是無生之性。阿難既陳諍問，如來就事以驗，逆順之境不辨，顛倒之情難脫。下文即破。

Erecting the hand is inverted, yet he considers it upright; because it does not follow the natural position of the body, this is inverted. Ānanda does not distinguish the true from the false, clinging to the false and losing the true; hence the Tathāgata reproaches him for acting in an inverted manner. Having realized that the false fundamentally has no essence, one should know that the true is inherently quiescent; hence he acknowledged that the seeing confronting the head's movement and the nature observing the river are themselves the true nature, with no separate true. Ānanda, failing to understand as before, thought there was a true outside the false, and so was unwilling to accept that I am an inverted person while the king has the nature of non-arising. Since Ānanda presented a contentious question, the Tathāgata tested him in terms of concrete facts; failing to distinguish contrary and accordant conditions, it is difficult to escape the inverted disposition. The text below immediately refutes it.