Tazkiyat al-nafs: Purifying the self
The Quran promises success to whoever purifies the self. The pull is always outward, toward the people whose noise looks like the whole problem, but their faults sit out of reach. The temper, the appetite, the itch to be admired: those a person can reach, and removing them changes what they are fit for.
Waraʿ: Holding back from what is doubtful
Al-Ghazali describes this as staying clear of the murky, not only of what is plainly wrong. Someone can break no rules and still go dull from what they let sit around them: gossip they enjoy, arguments they join for sport, small compromises they stopped counting. Keeping away from the murky things is what leaves a person clean enough to be trusted with something that matters.
Ikhlāṣ: Sincerity
The word means keeping an act unmixed, done for God alone. Work carried out partly for God and partly for applause has a second motive hidden in it, and the second motive is the one that spoils it. A person with a single purpose running through them can be counted on, because the same thing drives them whether anyone is watching or not.
Istiʿdād: Readiness to receive
Ibn Arabi taught that God gives each person according to what they are ready for. Nobody is handed work they cannot carry, and the readiness gets built quietly, long before anything is asked: small duties done well, promises kept, attention trained. Readiness of that kind is undramatic, and by the time the work arrives the person can simply do it.
When I love him, I become the hearing he hears with: God acts through the person's own hands
A saying of the Prophet describes God drawing so near to a servant that He works through their eyes and hands. The person here has been cleared of enough private agenda that ordinary actions start carrying more than they weigh. They do not feel chosen or lit up; they feel useful, and the good that comes through them never feels like their own accomplishment.