Jesus prayed for us, His disciples, that we may have joy and that joy might be complete ( see John 15:10-12). Why? Because the good news, the gospel is nothing else but laughter and joy ( Spurgeon ). When we realise that, when we encounter God for who He truly is, that truth will be so good, so great and too glorious to think true.
There will be happiness and amazement so large and obvious that all who see will glory God in heaven. I am not talking here about worked-up, hyped-up enthusiasm, but the pure joy that bursts of from a heart set free from the slavery of sin. Sure, there is tears also, for the seed has to be watered before the harvest, but the joy is real, the joy is endless. Dear Lord, I experience so little of that joy you prayed for me, can you help me to behold and live-out the joy of salvation. Amen.