101. This refers to the freedom that Allah has granted to mankind to believe or not to believe in Him. Otherwise He could have very easily created all the people as born believers and obedient servants and there would have been no disbelief and disobedience at all on the earth. Or He could have very easily inspired them to turn towards belief and obedience. But these methods would have defeated the wisdom that underlies the creation of mankind.
102. This does not at all mean that the Prophet (peace be upon him) desired to force people to become believers, and that Allah was forbidding him to do this. In fact, the Quran has here adopted the same method of admonishing the people that it has adopted at many other places, that is, though the words have apparently been addressed to the person of the Prophet (peace be upon him), in fact, these have been addressed to the people. The implication is this: “O people! Our Messenger has made the distinction between the guidance and deviation quite clear and plain by argument and pleading. Now, therefore, it is for you to believe or not to believe in the guidance. If you accept that someone should force you to adopt the right way, you should know that this duty has not been assigned to Our Prophet. Had Allah willed this, He could have done it Himself: then there would have been no need of sending any Prophet to you.