If we weigh the value of our happiness against the needs of a suffering world, we may suppose we have no right to be happy. But the fact is, miserable Christians have nothing to offer a suffering world. Our happiness in Christ, which involves not indifference but heartfelt compassion, allows us to help others and share with them the joy in Christ. It is this same happiness that energizes and sustains us as we serve God and others.

Spurgeon loved to connect the gospel and happiness: “There is nothing that more tends to strengthen the faith of the young believer than to hear the veteran Christian, covered with scars from the battle, testifying that the service of his Master is a happy service, and that, if he could have served any other master, he would not have done so, for His service is pleasant, and His reward everlasting joy.”

G. K. Chesterton (1874– 1936) has been widely credited with saying, “Jesus promised His disciples three things  — that they would be completely fearless, absurdly happy, and in constant trouble.”

Alcorn, Randy (2015-09-17). Happiness (pp. 33, 27, 25-26). Tyndale House Publishers, Inc.. Kindle Edition.