Psalm 42:5 Why are thou cast down, O my soul? and why art thou disquieted in me? Hope thou in God; for I shall yet praise Him for the help of His countenance.
Discouragement destroys hope, so naturally the devil always tries to discourage you. Without hope you give up, which is what Satan wants you to do. The Bible repeatedly tells you not to be discouraged or dismayed. God knows you will not come through victory if you get discouraged --- He wants you to be encouraged, not discouraged.
When discouragement or condemnation tries to overtake you, ask the Lord for strength and courage. Tommorrow is a new day. God loves you and His mercy is new every morning. Say, " I refuse to be discouraged. Father, the Bible says You love me. You sent Jesus to die for me. I'll be fine --- tommorrow will be a great day". Hope in Him!