"If you keep my commands, you will remain in my love, just as I have kept my Father’s commands and remain in his love. I have told you this so that my joy may be in you and that your joy may be complete. My command is this: Love each other as I have loved you."
JOHN 15:10-11
The joy of Jesus is the joy of love and its purity. As he pours his Spirit into you - accept him. Continually mold all of your ways of heart and mind into his loving care. Through this close fellowship you are brought to the Father.
God is a Spirit. You are his temple of choice should you openly request and pursue your Lord. In saying "yes" to your heavenly Father you say "no" to the world. In knowing Christ - you become his disciple and your kingdom work will begin.
The joy for Jesus is in relationship to Our Father in Heaven. His joy is measured by being in perfect harmony with God. This is the same joy he is speaking to us about. He is not speaking of Joy in the pursuit of happiness on a line that does not lead directly to God.
The understanding of God and his immense love is the only joy to pursue. This joy is from Christ and can only be obtained through him while in pursuit of him. It is the very hope of God that we will seek him, pursue his will and come to the understanding that we are called to be his witnesses and boldly proclaim Jesus to all people and all nations.