Commentaries:
The ancient Israelites expressed joy by singing, dancing, playing musical instruments, and shouting at victory celebrations, festivals, sacrifices, and coronations. Gladness and joy are blessings from God. Gladness is the experience of pleasure, joy, or delight, resulting from happiness and joy. Joy is a quality, not simply an emotion, grounded upon God Himself and derived from Him. It should characterize our lives as Christians. Joy springs from the prospect of possessing our desires and can be temporary or long-lasting.
Martin G. Collins
Joy