In Parshat Bereishit it starts with G-d creating the world. He created the world with ten utterances. With each holy command, our universe was formed. G-d gave man the gift of speech, which means out of all creatures of the world only humans are endowed with the ability to verbally communicate intelligently. Since, G-d created the world through speech we should be mindful that we too, have the power to create through the words that we speak. King Solomon tells us, "Death and life are in the tongue." We must be very careful with what comes out of our mouths.
Let us try to work on our speech towards the people we interact with on a constant basis.