"And though you have not seen Him, you love Him, and though you do not see
him now, but believe in Him, you greatly rejoice with joy inexpressible and
full of glory." 1 Peter 1:8

For those who belong to the Lord there is that joy unspeakable and full of
glory.  For all of mankind the occasions of great joy (though many will
reject them) are:
The coming of Christ,
"The angel said to them, 'Do not be afraid, for behold, I bring you good
tidings of great joy which will be to all people.  For there is born to you
this day in the city of David a Savior, who is Christ the Lord.'"
Luke  2:10-11
The resurrection of Christ,
"So they departed quickly from the (empty) tomb with fear and great joy, and
ran to bring His disciples word."  Matthew 28:8 (My emphasis) Read Vs. 1-8
The ascension of Christ,
"Now it came to pass, while He blessed them, that He was parted from them
and carried up into heaven.  And they worshipped Him, and returned to
Jerusalem with great joy."  Luke 24:51-52
The conversion of gentiles,
"So, being sent on their way by the church, they passed through Phoenicia
and Samaria, describing the conversion of the Gentiles; and they caused
great joy to all the brethren."  Acts 15:3
I would suggest that you read the above verses in context for the joyful
blessing they give.

We who are covered over with the righteousness of Christ know the joy of
that new life in Christ.  Isaiah, in 61:10, is speaking of the Church who we
are,
"I will rejoice greatly in the Lord,
My soul will exult in my God;
For He has clothed me with garments of salvation,
He has wrapped me with the robe of righteousness,
As a bridegroom decks himself with a garland,
And as a bride adorns herself with her jewels."

We rejoice because we are the Lord's and He loves us with an everlasting
love.  He is in control!  Knowing this, there is that peace in our innermost
being no matter what the circumstances.  And where there is that peace, joy
is inevitable.  I have found in my experience that I can not have one
without the other.

Jesus gave us His peace and His joy, neither depends on circumstances!
"Peace I leave with you; My peace I give to you; not as the world gives, do
I give to you.  Let not your heart be troubled, nor let it be fearful."
John  14:27

These things I have spoken to you, that My joy may be in you, and that your
joy may be made full."  John 15:11

Let us, with the Psalmist, sing to our Lord Jesus Christ with hearts filled
with joy and thanksgiving,
"I will give thanks to Thee, O Lord my God, with all my heart,
And will glorify Thy name forever." Psalm 86:12
Amen.