If you do not know the Lord Jesus Christ as your Savior, you are robbing yourself. Your rejection of the salvation provided by the death of God's Son on Calvary is causing you to miss the highest joy.
Not that a Christless man can have no joy. He may know the joy of health, friendship and domestic life. He may acquire money, power and fame, for God in mercy allows these blessings. It is "the goodness of God."
But, there are greater, higher and more lasting joys than these. An unsaved soul cannot know the joy of sins forgiven, the comfort and companionship of the Lord Jesus Christ, or the joy of becoming like Him. It is God's desire that all His children should be joyful—full of joy.
This joy is the portion of every true believer, those who have taken Christ as their Savior and know their sins forgiven.
But, how different for the one who is without Christ! God is a holy God and must punish sin. So, for those who "obey not the gospel of our Lord Jesus Christ" there is an eternal hell—they are lost forever! Oh, come to Christ today.