Commenting on the above, noor isn't a proof of salvation as it can go away for some people. Some get it due to circumstances they prosper in while they don't in others. It's something scientific, though. It comes from purifying the soul. Those who said that people see nur in some people due to a psychological expectation, I think is out of context. I've understood, since early on when I was muslim, that the nur is from faith so when I've heard great things about certain shaykhs, of course I've hoped and expected to see nur on them and when it was clear that they did not have nur, I tried to make myself think they did, lest I think the whole ummah was munafiqs, but deep down inside I knew they did not have nur, even with all their 'ilm. I was trying to avoid having evil suspicions but I knew that nur is empiracally visible if someone has it. Saying that you need faith to see it on someone else is not true. If you saw it on someone who didn't have it you were delusional and if you didn't see it on someone who did, same thing, or you were merely lying to yourself (trying to see someothing that wasn't there or trying to miss something that was) due to preconcieved notions or biases. I even saw nur on a christian once, in a homeless shelter, when he was in a particularly religious state, but it went away. It comes from purifying the soul and is not a proof that someone is going to jannah, except, maybe on the day of judgement. Besides that it can come and go off anyone who purifies their spirit, which is what makes the spirit shine through the flesh.