This I saw on a bumper sticker on truck, and it really illustrated to me how everyone should share their opinion. And not just that you have something worthwhile to share (probably not, although you think so), but that by discussing with others and with an open mind, you probably will learn a lot yourself.

And, important to note, is this is applies to writing and publishing as well, just the "voice shakes" part doesn't fit. (Change that to even if hesitant or afraid.)