We say, and we are not shy to say it:

For without our beloved Prophet (s) we would never have been guided to know Allah, the Mighty and Sublime, nor of the Angels, the prophets, the books of revelation nor of the Afterlife.

When our master 'Ali was asked about the strength of his devotion to Allah's Prophet (s), he replied: "By Allah, we cherished him more than we did our children, our parents and all of our possessions. He was much dearer to us than fresh water is for a thirsty soul." Such was the esteem and the honor the Prophet (s) was held in by his Companions. By the same token, the hearts of true believers ought to be filled with similar devotion to the Prophet (s).

Sending blessings on Allah's Beloved (s) is certainly the best way of invoking him, in compliance with the command of the Lord Almighty. In thus blessing him we show him gratitude and acknowledge his countless favors to us. To send blessings on the Prophet (s) is only a negligible payment for the unending benefits and good we have seen through him.