"You cannot do wrong and fell  right. It's impossible."
                                                -Ezra Taft Benson
When Ezra Taft Benson was saying this I believe he meant that you can't do something incorrectly and expect to feel great about it. If you do something wrong and you think it was the right choice event though you know it wasn't. Eventually the guilt will take over and consume you to the point that you can no longer think you did the right thing. Imagine if you were running for a competition. Every body was running the same way on the race track but you knew a shorter way. The results were that you were the first to make it to the finish line. How would you feel knowing that you took a short cut instead of taking the correct path? You would most likely feel horrible. You would not feel comfortable winning the 1st place medal. This is why "You cannot do something  wrong and feel right. It's impossible."