首楞嚴義疏注經 7.166

7.166

指轉相也。由前動故，覺動希靜，嫌妄欲真。希欲既生，轉增迷倒，不復元靜，但得影真，是虛妄心所變起故，故云已非真真如性。

This points to the mark of turning. Due to the preceding movement, one perceives the movement and longs for stillness, disliking the false and desiring the true. Once longing and desire have arisen, the confusion and inversion are further increased; one does not return to the original stillness, but only attains a shadow of the real. Because it is transformed by the false mind, it is said that 'it is already not the nature of true tathatā.'