What did Jesus say about Joy?

John 15:10-12  10"If you keep My commandments, you will abide in My love; just as I have kept My Father's commandments and abide in His love. 11"These things I have spoken to you so that My joy may be in you, and that your joy may be made full. 12"This is My commandment, that you love one another, just as I have loved you.

John 16:24
Until now you have not asked for anything in my name. Ask and you will receive, and your joy will be complete.
John 17:13
"I am coming to you now, but I say these things while I am still in the world, so that they may have the full measure of my joy within them.

The world may have changed, the people who serve God may change, but the Words of Jesus will stand forever!