"Not many of you should presume to be teachers, my brothers, because you know that we who teach will be judged more strictly." NIV translation
James opens up this section of his letter with a warning. We should not be teachers of the Word because of our own desire to do so as it must be a gift and calling from God. James warns us that, as teachers, God will judge our actions more strictly. This is not talking about a judgment of salvation but it speaks of the judgment of the saints and their works. It is much the same as what God said in Malachi 2. There, we see how seriously God takes someone leading His people astray. (The same is true today as James is saying here.) We must also say that, if God calls you to be a teacher (or to do anything else), He expects us to be obedient. That is not presuming; that is listening to the prompting of the Holy Spirit and being obedient.