Worthy is he who merits entering the chamber of the blessed Holy One, to behold the King and the Queen.
Worthy is the mouth [which is the ‘chamber’ of YQV”Q] in which resides prayer – which is ADNY, to Whom they say: (Ps. 51:17) “ADNY! Open my lips...” And worthy are the lips that are gates to the chamber, like those of whom it is stated: (Ps. 118:19) Open for me the gates of righteousness...
For when his mouth opens in prayer with the Shekhinah, then Y”Y answers immediately. It is this that is written: (Is. 58:9) Then (az) shall you call, and Y”Y will answer... AZ (then, =8) – eight letters: YQV”Q EQY”Q.... and Y”Y will answer... – He and His court of judgement, and this is: YQV”Q ADNY: Y-A-Q-D-V-N-Q-Y.