Never

"You can't be right by doing wrong; you can't be wrong by doing right." -Thomas S. Monson

I agree with this statement because those are the unspoken rules of life. To explain: If you do right you are doing the right thing, and at times end up with a reward, and when you do wrong you are doing wrong which most likely ends with you in trouble (ex. detention or jail). For example if you have a very important test and you do the right and you study ending up with a good grade you are doing the right thing. But let's say that you cheated on the test, you are doing the wrong thing therefore it is wrong. Let's go back to the unspoken rule part I said at the very beginning, okay so let's say there is this very cute troublemaker in your class that always does the wrong thing, does he A)Do the right thing and gets in trouble for doing wrong, or does he B)Do the wrong thing because he knows he is going to get in trouble because it is wrong. Now I'm not saying you follow his footsteps at doing the wrong, but at least this troublemaker knows that  doing wrong actions is wrong, not doing right actions. Doing the right thing can never be wrong; is it wrong to volunteer and help the less fortunate? No. Is it wrong to study and get good grades? No, the endless possibilities of doing the right thing are never wrong. Never forget that. And do not let anyone tell you different.