When you are in a meeting, you are supposed to listen twice as much as you speak… How can you show you are really interested in others’ opinions?

When you are in a meeting, you are supposed to listen twice as much as you speak… How can you show you are really interested in others’ opinions?
We are often very guarded and wary of sharing information as we approach a negotiation. Why is that? Is it smart sharing information in a negotiation? Let’s explore the subject.