The good news isn't that God is victorious. How can He not be victorious? The good news is we can be victorious, too.
Grace stands in direct opposition to any supposed worthiness on our part. To say it another way: Grace and works are mutually exclusive. As Paul said in Romans 11:6, "And if by grace, then it is no longer by works; if it were, grace would no longer be grace. " Our relationship with God is based on either works or grace. There is never a works-plus-grace relationship with Him.