salam bro
For the Prophets it has always been a law that whatever Command they receive from Allah, they have to act on it as a duty which they cannot in any case avoid. When Allah enjoins something on His Prophet, he has to accomplish it even if the whole world is deadly opposed to it. People in our age have given wrong interpretations of this verse and opened the way to a great mischief.
This one sentence arts at the root of all those objections which the opponents were raising in connection with this marriage of the Holy Prophet. Allah knows best why it was imperative to get the custom of ignorance rooted out at that juncture through the Holy Prophet Muhammad (upon whom be Allah's peace) rather than let it remain as it was. He knows that no other prophet would be coming after him in the future; therefore, if He did not abolish this custom through His Last Prophet, no other person after him would be able to abolish it for all the Muslims of the world for ever. Even if the later reformers would abolish it, no action of any one of them will have the permanent and universal authority behind it so that the people of every country and every age might -start following it, and none of them would have a personality endowed with that holiness and sanctity that an action's being merely his way (Sunnah) might root out every feeling of aversion and abhorrence from the mind of the people.