By emphasizing something in your writing, you are drawing it into relief, or bringing shape to it, drawing it out of a complex fabric of interconnection. This brings that thing or subject into your attention, and into the attention of your readers, which results in actual practical changes. When you are aware of something and perceive something, you become affected by it, and you may affect it in turn.
Becoming aware of something, and taking enough interest in it to actively emphasize it and draw attention to it is part of what you are.
