Joy

"Although joy is something which manifests itself visibly, at the bottom it is spiritual as to its source and nature. That is why, apart from God, 

'even in laughter the heart is sorrowful; and the end of that mirth is heaviness' (Prov 14:13). 

It is true that the people of God in every age have known in their hearts the joy of the Lord; but all their rejoicings have been tempered by a somber note, as they faced the uncertainties and problems inevitably present in human life this side of the Kingdom. 

At the coming of the King all this will be changed: He will come to 

 'comfort all that mourn...to give unto them beauty for ashes, the oil of joy for mourning, the garment of praise for the spirit of heaviness' (Isa 61:2-3)."

---Alva J. McClain, The Greatness of the Kingdom, pg. 220---