The thing that strikes me about this verse is the phrase "and shall teach men so." I don't think that we always realize what we are teaching others. Teaching doesn't only happen in a formal classroom setting. It is the example we set and the things that we do every day. And when we break a commandment, even a small one, we justify it to ourselves... but we're also teaching the people around us that there are exceptions to God's laws under certain circumstances, and that it is okay to justify to get out of a responsibility. This is a dangerous thing to believe, and to teach... not the part about there being exceptions, but the part where we assume that we are one. God gets to make exceptions when necessary, as he did in the case of Nephi and Laban for instance, but we don't get to decide that we are exempt from God's commandments whenever they are inconvenient, or pick and choose which ones apply to us. God's commandments apply to us all by default. :)
Today, let's consider what our actions and our lives are teaching the people around us. Especially in formal classroom settings, let's make sure we have our facts straight about the gospel and that we aren't just teaching opinion. If we aren't obeying some commandments, let's revisit those areas with God and be willing to do as he asks. Let's not accidentally teach others to disrespect God or that the gospel is unimportant. Let's show them how important it is by the way we live our lives.