Or do you not know that the saints will judge the world? And if the world is to be judged by you, are you incompetent to try trivial cases? Do you not know that we are to judge angels? How much more, then, matters pertaining to this life!
Proof texting is an ugly thing. For example, that quote from 2 Corinthians has the misfortune of seeming to contradict Jesus' own words in, say, Matt. 7:1-3. The secret to untangling that mess is to understand the context.
God alone knows our relationship with Him -- it is not for us to judge that.