Can our Words be like Poisoned Arrows? / WWY Q&A 56

"You are what you eat" as the cliche goes. But can that same cliche apply to us - that is our heart as well. Are we what we speak?

Mat 12:34 “Brood of adders! How are you able to speak what is good – being wicked? For the mouth speaks from the overflow of the heart.

How does this work in the spirit realm? and what other truths does the Bible have to say on this topic.

I can't say my heart & mouth are sinless but I do believe this is an area we can ALL work on.