Chances are that those who always speak negatively have negative attitudes toward life all the time as well. Even if the reality in front of you is tough to swallow, you will lose heart if you keep saying, "I cant stand it. Its way too much." On the other hand, if you just say with faith, "I can do it. God is with me. I am so blessed," you can bolster your courage and receive strength. Also, things will go as you confess with your lips. Consider Proverbs 13:2 that says, "From the fruit of a mans mouth he enjoys good, but the desire of the treacherous is violence." We have to lead a wise life by minding our words that pass over our lips.