[2:151] As also We have sent among you, of yourselves, a messenger, to recite Our verses to you and to purify you, and to teach you the Book, and wisdom, and to teach you what you knew not.
The sending of the Messenger was to open the gates of attainment, for it was in His (s) prior knowledge that the hearts of His friends would be thirsty to meet Him. There is no way for anyone to Him except through the intermediary of the messengers. Through sending messengers He charged some people with the burdens [of prescriptive law] (kulaf) and by the sending of messengers to others, He honored them with the arts of drawing near and approaching (zulaf). What a difference between one people and another!