It doesn't matter how good your idea is
I just re-watched Susan Cain's TED Talk in which she states that “there’s zero correlation between being the best talker and having the best ideas.” She's absolutely right about that. However, although it's totally unfair, people often judge the merit of an idea based on how well it's communicated.
Many great ideas are never heard, especially in work environments that are often dominated by extroverts. The problem is that we tend to communicate in a way that’s most neurologically comfortable for us - and that approach will not work for a segment of your audience.
To ensure that your ideas are truly heard, you must consciously communicate in a way that works for every member of your audience, every time you speak.