The degree of peace...
The degree of peace, the percent of guarantee, and the secrets behind that greeting is beyond our ability to fathom or reason. In the Tradition of the Cloak , the narration begins with greeting of peace by the Holy Prophet (SA) after he has entered the presence of his daughter Fatima Al Zahra (AS) who replies back affirming the peace to her father.
As discussed, this exchange of peace by two holy and exceptional personalities, the Seal of Messengers and the best of Creation, Muhammad, along with the Master Lady of the universe, Fatima, yields nothing but unbreakable unity between two purified souls which carries with it all the meanings of peace, tranquility, attachment, love, and devotion, etc. Such feeling of peace is not bound by time or place nor is it conditional on mundane factors.
(33:56) In this verse*,* it is interesting to note that Allah the Almighty Creator first announces that He Himself along with the angels are praying on the Prophet. Then He (SWT) conveys His order to those who believe (hence excluding nonbelievers) to call for the blessings upon him and to salute him. This action of benediction and salutation to the Holy Messenger (SA) is an act of worship and obedience and is in fact obligatory upon all believers.
Furthermore, the verse highlights that only a true believer is given the permission to share in this blessed action of salutations and the servant is the one honored by having the ability and success in delivering these greetings to the beloved one. If this is the grand station of (SA) as depicted by verse 33:56, what about the station of Lady Fatima?