Have you ever had a brother or sister in Christ make you feel worthless? In 2 Samuel, David became depressed, and his attitude hurt others. General Joab saw the damage he was doing and told David,
"You have today covered with shame the faces of all your servants.... For you have made it clear today that commanders and servants are nothing to you! Now therefore arise, go out and speak kindly to your servants, for I swear by the Lord, if you do not go, not a man will stay with you this night, and this will be worse for you than all the evil that has come upon you from your youth until now.”
David hurt others just by being demoralized. Being actively negative is far, far worse to our brothers and sisters. Look for every reason to encourage, even when you're at your most discouraged.
"For the entire Law is fulfilled in in this one word: "You shall love your neighbor as yourself."—Gal 5:14