One will generally express gratitude to a person in proportion to the favour he has received from him. Hence, the greater the favour that one enjoys, the more gratitude one will express.
Without doubt, Sayyiduna Rasulullah صلى الله عليه وسلم is the greatest benefactor of every Ummati; he brought us Deen, he guided us towards Allah Ta’ala جل جلاله and showed us the path of salvation. Hence, when his favour upon us is the greatest, then we should show him the highest gratitude from all people – even more than we show to our parents. Thus, no matter how much Durood we convey upon Sayyiduna Rasoolullah صلى الله عليه وسلم, we can never repay him for his favour upon us.
Apart from this, Allah Ta’ala جل جلاله has blessed Sayyiduna Rasulullah صلى الله عليه وسلم with the highest rank from among the creation, and has commanded us to send Durood upon Sayyiduna Rasulullah صلى الله عليه وسلم and show gratitude to him for the favours we have received through him. When a child is born, both the Adhaan and Iqaamah are called out in his ears; we are commanded to take the name of Sayyiduna Rasulullah صلى الله عليه وسلم with the name of Allah Ta’ala جل جلاله. On many other occasions of ibaadah, the blessed name of Sayyiduna Rasulullah صلى الله عليه وسلم is taken with the name of Allah Ta’ala جل جلاله.
Since the virtues of Durood are so great, Sayyiduna Rasulullah صلى الله عليه وسلم has informed the Ummah of the great loss of those who neglect to recite Durood upon him
Hazrat Abu Sa’eed Khudri رضي الله عنه reports that Sayyiduna Rasoolullah صلى الله عليه وسلم said; “People do not sit in any gathering in which they do not recite Durood upon (Sayyiduna) Rasulullah صلى الله عليه وسلم except that it will be a means of regret for them (on the Day of Qiyaamah), even though they may enter Jannah, on account of them seeing the reward (which they failed to acquire by neglecting to recite Durood).”
(The Gift of Durood and Salaam pg.73)
يَا رَبِّ صَلِّ وَسَلِّمْ دَائِمَاً أَبَدًا عَلَى حَبِيْبِكَ خَيْرِ الْخَلْقِ كُلِّهِمِ
“O Sustainer, shower Salaat and Salaam forever and ever upon Your beloved, who is the best of all creation.”
جَزَی اللہُ عَنَّا نَبِيَّنَا مُحَمَّدًا صَلَّی اللہُ عَلَیْه وسَلَّمَ بِمَا هُوَ أَھْلُهُ
May Allah Ta’ala جل جلاله reward our Nabi Muhammad صلى الله عليه وسلم on our behalf such a reward that is due to Him.