In Romans 5 we see this, "And hope does not put us to shame, because God’s love has been poured out into our hearts through the Holy Spirit, who has been given to us."
The Holy Spirit, often depicted as a dove, pours God's love into our hearts. Our hearts become the very vessel that contains, is filled up with God's love. And that, that is the only place where joy can come from.
So rejoice! Have joy! God's love is yours!