تَبَارَكَ ٱلَّذِى نَزَّلَ ٱلْفُرْقَانَ عَلَىٰ عَبْدِهِۦ لِيَكُونَ لِلْعَـٰلَمِينَ نَذِيرًا

Blessed is the One Who sent down the Decisive Authority to His servant,
so that he may be a warner to the whole world.

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For a beleiver this ayah is Concerning. Allah is saying that this Quran is something by which we will be judged. the Qur'an itself as the decisive factor between good and evil. Everything we do today goes against this Quran. We are making choices and decision based on other people & Circumstances. We Never Take This Quran as the Decisive authority as it is.