‘You are the door of Allah; whoever attempts to enter [the Divine Presence];
From a door other than yours shall not enter it.’ – Poem
A prayer upon the Prophet Muhammad ﷺ is a ladder and means of [spiritual] ascent to arrive unto God.
That is because sending prayers upon him ﷺ frequently engenders the Prophet’s love, and the Prophet’s love engenders Allah’s love, and Allah’s love for the servant attracts the servant to the Divine Presence—with or without an intermediary.
The Messenger of Allah ﷺ is Allah’s Supreme Sentinel [al-hijab al-a’zam] & noblest door.