If we want good fruit for the Kingdom in our lives, then it must be our choice that we speak only blessing and life. When we make the right choice, God comes to help us by His Holy Spirit at work within us. Our words have power. Power for evil and power for good. Power for life and power for death. Our circumstances are not under our control. But the way we respond to them, and talk about them, is our choice. We can speak positively with faith into our circumstances, or negatively with doubt and unbelief.