A Christian says...

"Not a single person on earth is always good and never sins." (Ecclesiastes 7:20)

Therein lies the need for God's grace. Grace is nothing that we can earn, but instead, is given freely to those who repent and believe.

Being a Christian isn't about having an easy life, a sinless life, or a life full of prideful accomplishments, but rather a life of recognizing we "still" sin (but are forgiven), that we can call on Him in times of hardship (as He'll never leave us), and a life of spreading the good news of the hope and salvation found only in Jesus Christ (as we are commanded).

Now go, and make disciples of all nations, remembering always, ​"To act justly and to love mercy and to walk humbly with your God." (Micah 6:8)