The devil is having a big sale in his store of evil tricks. Everything has a price except for one box that has no price. It is not for sales.
After almost everything has been sold, his demonic assistant asks him about what is in the box without a price.
The old devil whispers, "It's Discouragement! When all temptations fail, I have this box of potent tricks to use! I have more success using these against the Christians than any other tricks! Once hit, few have the strength or wisdom to rise to their former glory. Many just become mediocre & die fruitless! Isn't that great!" (aksermonillustrations.blogspot.in)
“The remedy for discouragement is the Word of God. When you feed your heart and mind with its truth, you regain your perspective and find renewed strength.” - Warren Wiersbe.
Heb 10:25 (GNB): “Let us not give up the habit of meeting together, as some are doing. Instead, let us encourage one another all the more, since you see that the Day of the Lord is coming nearer.”