Sura Al-Ala was said to be one the favorite suras of Muhammad. This sura includes the basic Islamic concept of life and existence, the unity of ALLAH, reality of divine revelation and mentions the reward and punishment in the hereafter.
Human often hide things from each other and from himself as well. The sura reminds that Allah knows things that are declared and things that lie hidden. The final verse of this sura affirms that the message of this sura was also revealed to Abraham and Moses in their scriptures.