The name Muhammad means "Praiseworthy" and occurs four times in the Qur'an. The Qur'an addresses Muhammad in the second person not by his name but by the appellations prophet, messenger, servant of God ('abd), announcer (bashir), warner (nathir), reminder (mudhakkir), witness (shahid), bearer of good tidings (mubashshir), one who calls [unto God] (dā‘ī) and the light-giving lamp (siraj munir). Muhammad is sometimes addressed by designations deriving from his state at the time of the address: thus he is referred to as the enwrapped (al-muzzammil) in Qur'an 73:1 and the shrouded (al-muddaththir) in Qur'an 74:1. In the Qur'an, believers are not to distinguish between the messengers of God and are to believe in all of them (Surah 2:285). God has caused some messengers to excel above others 2:253 and in Surah 33:40 He singles out Muhammad as the "Seal of the Prophets". The Qur'an also refers to Muhammad as Aḥmad "more praiseworthy" (Arabic: أحمد, Surah 61:6).