John 15:10-11 If you obey my commands, you will remain in my love, just as I have obeyed 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.
John17:13 I (Jesus) say these things while I am still in the world, so that they may have the full measure of my joy within them.
The joy of the Lord is a direct result of obeying Gods’ commands, which are discovered by reading Gods’ word. If you desire to have the fullness of joy in your life, look to the bible. Jesus' words were spoken so that we would have the full measure of joy.