Words do carry power, but your body language is speaking over them.
Albert Mehrabian, who performed research on verbal and non-verbal communication, determined that communication was 55% nonverbal, 38% verbal and 7% words only. Mehrabian found that where there were inconsistencies between the verbal and non-verbal cues during communication, the non-verbal cues would dominate to determine the attitude of the speaker.
So, if you were to tell someone, “I don’t have a problem with you,” but didn’t make eye contact and frowned while saying it, the person would believe the non-verbal cues over your statement, not believing what you said.
How we interact is as important as the words we say.
Are you making eye contact or looking away? Are you frowning or scowling? Are you standing or sitting close or keeping the person at a distance? Are you preoccupied with your phone, computer, or something else instead of giving undivided attention? Are you frequently looking at your watch?
These might be unintentional, but unintentional or not, they will shout over the words you are saying.
And don’t forget the tone you use as well.
Be intentional in your conversations. Focus on the individual and practice active listening which will help maintain a focus with the person talking and then be mindful of your body language which could be inadvertently communicating a message you do not mean. Maintain eye contact, don’t be distracted with other things while talking or listening and smile (or at least don’t frown).