Exaggeration of pessimism leads to fatalism and despair, in the belief that we have no control over what happens in life:
In Christ, these fatalistic beliefs are conquered:
"Where, O death, is your victory? Where, O death, is your sting? The sting of death is sin, and the power of sin is the law. But thanks be to God! He gives us the victory through our Lord Jesus Christ. Therefore, my brothers, stand firm. Let nothing move you. Always give yourselves fully to the work of the Lord, because you know that your labor in the Lord is not in vain."
I Corinthians 15:55-58 NIV