In other words, use conversation effectively. Conversation is our tool to be in contact with other human beings. Unless we communicate, we're all alone. Speech is therefore what distinguishes human beings from other creatures. We can be self-centered and closed up.
Conversation is a way out of that self-absorption.
Too many friendships never get beyond the superficial stage. It's possible to talk endlessly about recipes, football and fashion. But that's not enough. We need people with whom we can share our innermost thoughts. Even family members can live in communicative isolation.