Certainly it's important to speak when attempting to convey a thought or idea, but it's vitally important that the ear be trained (and re-trained) to hear, to absorb both the words spoken/written, and their deeper meanings. That can only be done by listening.
Sounds trite, doesn't it?
We can listen and not hear. We can hear and not listen.
Sound is merely noise until something in the way of sense, or comprehension is affixed to it. Sometimes that happens rather quickly, though most of the time it takes longer - as if savoring a word or a collection of thought brings out their true luster (or bluster).
I've been listening for several days now. I'm not sure what I'm listening for, but I know I'll recognize it when I hear it.
It is the province of knowledge to speak,
and it is the privilege of wisdom to listen.
~ Oliver Wendall Holmes