The Qur'an calls itself a clear guidance. How can it be a concealed Message?
75:17 It is up to Us to gather it and the reading of it. [He will bless whatever effort we put into its learning]
75:18 Thus, when We read it, follow the reading. [Although these verses are addressed to the exalted Prophet, every believer can sense as if the Qur’an is talking to him/her]
75:19 Then, it is for Us to explain it. [The Qur’an is its own best commentary. It explains itself]