Taken from a comments section of a blog I regularly read (BurnsideWriter'sBlog). Interesting thought that I had previously never really considered:
"... it drives me nuts when people refer to sins as "mistakes"; if you cheated on your wife, or posed for pictures you now regret, or embezzled money, or used a racial slur, you didn't make a mistake. A mistake is when you misspell a word, or when you say "Jerry Lewis" when you meant to say "Jerry lee Lewis". A sin is a sin, not a mistake. I should know. I've sinned a lot. Calling it a mistake is a way of minimizing it."