All first impressions are non verbal, for example, when you walk down the road, your subconscious mind will automatically begin to categorise the people you see in your preconceived frameworks. I think that first impressions are when we become a blip on other people's radar not when we open our mouth. It's an immutable law in business that words are words, explanations are explanations, promises are promises but only performance is reality.
“Before you talk, listen.
Before you react, think.
Before you spend, earn.
Before you criticize, wait.
Before you pray, forgive.
Before you quit, try.”