I have prepared for my servants what no eye has seen: the promise names its own limit
A saying of the Prophet carries almost these same words as God's own. Anyone waiting on a promise starts filling in the details from the best things already known to them. Being told straight out that no picture will match keeps the waiting honest, and the promise stops getting shrunk to the size of a good day.
Ghayb: The unseen
Ghayb covers whatever is held back from sight and report, known only to God. A person standing in front of it has nothing to inspect, so the only question left is whether the one holding it can be trusted. That moves the weight off information and onto the character of the giver. Not knowing the contents stops feeling like being cheated.
Not being able to grasp it is itself the grasp: the limit belongs to the knowing
The line goes back to Abu Bakr, and al-Ghazali repeats it constantly. Someone who reaches the end of what they can picture has not lost the thread; they have found the right size of the thing. The mind settles instead of manufacturing images it will later have to defend. A person can hold something as certain and still admit they cannot picture it.
Dhawq: Tasting
Dhawq means knowing something by having it yourself. Describing a fruit never gives the flavor to a person who has never eaten one, and words about God work the same way. That explains why nothing arriving through the eyes or the ears can deliver this. Reports point at it, and the having of it is a separate event.
Rabia wanted to put out hell's fire and burn paradise: loving with no eye on the payment
Rabia is remembered saying she would do both, so that people would love God for himself. What is stored up belongs to those who love, and love that keeps checking the reward has slid into a trade. Someone loving that way would keep loving with nothing coming. The gift lands on people who were not counting on it.
Liqāʾ: Meeting God
Liqāʾ names the meeting itself, being in his presence. Al-Ghazali held that this outweighs every other pleasure of the life to come. Someone who loves wants the person, not the presents. So the heart is waiting for a person, and a person is what has been kept for it.