The Word of God tells us that every good gift comes from God. Satan likes to distort the good things of God.
One way Satan likes to distort the good things of God is through discouragement. Each one of us is created in the image of God. We are valuable to Him.
Also, Satan discourages by telling us our work is not valuable to God. Remember, God has gifted us with talents to use for His glory. Your work is valuable.
Additionally, Satan likes to discourage us by highlighting our sin. Remember, all of your sin has been washed in the blood of the Lamb. Your sins are remitted, be encouraged.