A quality post is also one that creates more questions, initiates a genuine conversation, makes you think and look at things from a different perspective. A good post can change your initial opinion.

Tupac once said that he won't change the world, but he will ignite a spark in the person that will change the world. A good post can do that to. It can give you the idea you needed to make something happen.     
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I definitely wouldn’t say that quality posts need to be in that caliber to be called a “quality post” because a good post doesn’t necessarily need be thought provoking, but posts of that caliber are definitely up there in terms of standard; and I’m definitely highly more likely to be giving merits to such posts.

Also, +1 for Tupac