This letter, written to Nur Muhammad Tahari, informs that Allahu ta'ala is not like anything and that He cannot be comprehended through the intellect:

Hamd be to Allahu ta'ala. Salam upon those slaves of His whom He has chosen! Your honorable letter has arrived here. You write that your states have always been changing. Know that Allahu ta'ala is not within the alam, nor is He outside the alam. He is not apart from the alam, nor is He united with the alam. Allahu ta'ala exists. But He is not within or outside, united with or apart from it. Allahu ta'ala must be known as such, must be searched for as such, and found as such. If one has reached such an understanding [that is, contrary to the above definition], though it may be in a small scale, it will be understood that one has got stuck in shades and appearances. Allahu ta'ala must be looked for as a being never like anything and never comprehensible. One must struggle to reach that grade in an incomprehensible manner. This great blessing can be attained only through the sohbat of a murshid-i kamil. It cannot be explained or comprehended through writings or words. Try to do your duty! Write about your states until we see each other!