Nūr: Light
Al-Ghazali uses this word for the one light with nothing standing behind it. Everything that ever showed you something, a person, a book, a stretch of good luck, was passing along light it had been handed. Losing one of those carriers feels like losing light itself, though the supply was never theirs to begin with.
The world is all darkness, lit only by God appearing in it: nothing shines on its own
A line from Ibn Ata Allah. When life is bright, a person credits the bright things and slowly starts leaning on them. Once those fade, the whole world looks empty, until it becomes clear the light was arriving through them rather than starting there.
Faqr: Poverty, having nothing of your own
The Quran tells people flatly that they are the needy ones and God is the rich. Someone stripped of what used to hold them up feels like a beggar and reads that emptiness as personal failure. Poverty as the Sufis mean it puts everyone in the same position, since no one ever carried a private supply. Having none now turns out to be ordinary.
Tajallī: God showing himself
Ibn Arabi's term for the moment God comes through directly rather than by report. Most people live on secondhand accounts: what they were told, what they remember, what they hope is still true. Those accounts wear thin under pressure, and the wanting for the thing itself can get sharp. Tajallī names the times that wanting is met and the knowing becomes firsthand.
Everything perishes except his face: one source has no ending
Al-Ghazali comes back to this line from the Quran again and again. Anyone who has watched good things end starts holding the next one at arm's length, half braced for the loss. Hearing that one source cannot run out speaks straight to that bracing. Nothing about it can be taken away later, so leaning on it costs a person nothing.