Sakina is stillness that comes down. The Quran uses the noun for what God sent upon the Prophet and Abu Bakr when they were hiding in the cave from pursuers, and upon the believers at Badr and Hunayn when they were frightened. The grammar is consistently one of descent: it is sent down onto people, not generated by them. The word shares a root with the Hebrew shekhinah, the indwelling presence, and the parallel is not accidental — the Semitic root carries the sense of dwelling and settling. What is described is specific: fear leaving a body that has entirely reasonable grounds for fear, and the resulting steadiness being the evidence rather than the reward. It is the closest thing in Islamic vocabulary to the peace that passes understanding, and like that phrase it is reported most by people whose circumstances did not improve.