Hey, I'm writing in first person. The story is written somewhat like the MC is looking back on his life. Problem is, at the time of telling the story, he knows alot more than he did when the events occured. An example: "It remained a mystery to me." Is that proper language? Bringing it into present tense by saying: "It remains a mystery to me." won't work, since at the time of telling, the MC does know the solution to the mystery. "It was a mystery to me." doesn't quite do it either, since it remained a mystery to him for the duration of the story. However, after the story has finished, the reader can assume that he would know the answer (indirectly).