" The Greek word for “joy” is chara, derived from the word charis, which is the Greek word for grace. This is important to note, for it tells us categorically that chara (“joy”) is produced by the charis (“grace”) of God. This means “joy” isn’t a human-based happiness that comes and goes. Rather, true “joy” is divine in origin, a fruit of the Spirit that is manifested particularly in hard times. Someone may feel happiness, merriment, hilarity, exuberance, excitement, or “high spirits,” but all of these are fleeting emotions. On the other hand, “joy” is a Spirit-given expression that flourishes best when times are strenuous, daunting, and tough! "

― Rick Renner , Sparkling Gems from the Greek: 365 Greek Word Studies for Every Day of the Year to Sharpen Your Understanding of God's Word