https://www.youtube.com/watch?v=XX7jgqnv8qU

Luke 2:10 "And the Angel said unto him fear not for behold I bring you good tidings of great Joy which shall be to all people"
The word "fear not" occur several times in the Bible, any time God wants to say something Big.

God is saying he is bringing good tidings to you, so you need not to fear.

Joy is the fruit of the Holy Spirit

Happiness is tied down to a particular event.
There are times when men say there is a cast down, but Joy keeps flowing

Joy means Gladness, Cheerfulness
James 1:2 "My brethren count it all Joy when you fall in diverse temptation"

This kind of Joy we are talking of is not overconfidence, its premised at our sufficiency in God

The reason why we should have this Joy is because our future is premised on God, not on the fact that we work hard.

Joy becomes strength when God is backing you.

The best epistles in the new testament were written in the prison, just because the Joy of the Lord gave him strength

Whenever we ear the word of the lord, there should be rejoicing, because the Bible says Heaven and Earth ll pass away,
my word will not go away.
-Hebrew 12:2 "Looking unto Jesus the author and the finisher of our faith, who for the joy that was set before him"

Let the Joy of the Lord be your strength, even when things are not working perfectly, just have Faith.