This one is one of my favourites in regards to its message. And it's oh so true.

Words can be a prison
And they can't ever be forgiven
Words can feel like heaven
And making you want to hear them again
Words can build you up
Words can break you down
Start a fire in your heart
And can put it out
They can mean the world to you
And change it too
No one can stop them
And they can be as beautiful as a gem
But they are the strongest weapon
And we are the only ones who can control them