The Devil can really tell you a lot of truth about yourself that's horrible, not to speak of the lies he tells you. One of his favourite tactics is to try to persuade you to quit by hitting you with a barrage of doubt, discouragement and self pity! If we don't keep our eyes on the Lord and our mind on His Word, we're doomed to defeat, doubt, discouragement and final failure.
When you're discouraged, the Devil tries to make you mad at the truth because he's afraid of being defeated by it!--And if you listen to the Devil's lies, you'll even forget the Words of God! If you spend your time listening to his doubts and murmurs, and singing his dirges, you'll even forget God's praises.
So rebuke the Enemy in Jesus' Name when he tempts you with negative thoughts. Start praising the Lord, and you'll often praise your way right out of the pit into which the Devil is trying to cast you! When he comes around with his doubts, lies and fears, don't just stand there; do something--sing, shout, praise the Lord, quote Scriptures! Sock it to him with the WORD! The Devil can't take the Word! He'll turn tail and run!