The sloka which is quoted below is an outpouring of a Jeevanmukta. Here we have the essence of the advaitic thought.
This golden sloka is no longer recognized as lines from Maharsi Vedavyasa, Sri Shankaracharya or Sri Appayya Dikshita, .... even though it is attributed to them by some.
"I have helplessly committed three offences, for which I pray forgiveness. (1) In meditation, I imagined that you have a form, when you have no form. (2) Oh spiritual master of the worlds, even though you are beyond the power of words to describe, I have ignored this limitation when praising you. And (3) When I go on pilgrimage to you few places, calling them holy. Thus, I deny that you are all-pervading. Please excuse me - O Lord."