Sure, I forgot to think and it slipped out is a great excuse to hurt someone. I just said what came to mind, I never really thought about it. What about the things that we don't say because we thought about it? What about the damage they do? THose thoughts rather ever made audible reflect the condition of our heart. What happens when they are verbalized? Can we ever really take them back? Maybe but have the thoughts gone? Or do the thoughts remain just being pushed further into our subconscious way of going about life?
Our words are a mere voice for our hearts. Our thoughts are nothing more than words waiting to be verbalized. Don't apologize for what you say but for the condition of our hearts.