There seems to be an interesting correlation between how formal a conversation is and how impactful it is. Sometimes, formalities are necessary. But, most of the time, something that comes "straight from the heart" communicates in ways beyond the scope of even the most well-chosen words.
I preached a sermon this morning that, as far as planning goes, was the one which I have spent the least amount of time preparing for, simply because I did not have enough time this week. And yet, after service this morning, I got far more immediate feedback than with any other sermon I have preached. This correlation between formality and effectiveness seems to hold true not only in public speaking, but in every day conversation.
When you're talking to someone, speaking from the heart will almost always mean more than well rehearsed words. Be genuine. Be transparent. Be vulnerable. It will mean more to people and stick with them so much longer.