首楞嚴義疏注經 8.565

8.565

念緣前境，繫心不忘，專注弗移，久而發用，照明境界，咸悉化源，如定發慧，故名照行。

Directing thought toward preceding objects, fastening the mind without forgetting, focusing without shifting, with time this gives rise to function, illuminating realms and entirely transforming origins, like concentration giving rise to wisdom; hence called illumination-roaming.