Jesus told this very clearly. Hence not adding any explanation. Desire this abundant, overflowing joy. Jesus told this only because it is possible.
Given below are verses from various versions of the Bible.
John 15:10–11
English Standard Version
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. These things I have spoken to you, that my joy may be in you, and that your joy may be full.
John 15:10–11 — The New International Version (NIV)
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.
John 15:10–11 — King James Version (KJV 1900)
If ye keep my commandments, ye shall abide in my love; even as I have kept my Father’s commandments, and abide in his love.
These things have I spoken unto you, that my joy might remain in you, and that your joy might be full.
John 15:10–11 — New Living Translation (NLT)
When you obey my commandments, you remain in my love, just as I obey my Father’s commandments and remain in his love. I have told you these things so that you will be filled with my joy. Yes, your joy will overflow!
John 15:10–11 — The New King James Version (NKJV)
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.
“These things I have spoken to you, that My joy may remain in you, and that your joy may be full.
John 15:10–11 — New Century Version (NCV)
I have obeyed my Father’s commands, and I remain in his love. In the same way, if you obey my commands, you will remain in my love. I have told you these things so that you can have the same joy I have and so that your joy will be the fullest possible joy.
John 15:10–11 — American Standard Version (ASV)
If ye keep my commandments, ye shall abide in my love; even as I have kept my Father’s commandments, and abide in his love. These things have I spoken unto you, that my joy may be in you, and that your joy may be made full.
John 15:10–11 — 1890 Darby Bible (DARBY)
If ye shall keep my commandments, ye shall abide in my love, as I have kept my Father’s commandments and abide in his love. I have spoken these things to you that my joy may be in you, and your joy be full.
John 15:10–11 — GOD’S WORD Translation (GW)
If you obey my commandments, you will live in my love. I have obeyed my Father’s commandments, and in that way I live in his love. I have told you this so that you will be as joyful as I am, and your joy will be complete.
John 15:10–11 — The Holman Christian Standard Bible (HCSB)
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 spoken these things to you so that My joy may be in you and your joy may be complete.
John 15:10–11 — The New Revised Standard Version (NRSV)
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. I have said these things to you so that my joy may be in you, and that your joy may be complete.
John 15:10–11 — The Lexham English Bible (LEB)
If you keep my commandments, you will remain in my love, just as I have kept my Father’s commandments and remain in his love. I have spoken these things to you in order that my joy may be in you, and your joy may be made complete.
John 15:10–11 — New International Reader’s Version (1998) (NIrV)
If you obey my commands, you will remain in my love. In the same way, I have obeyed my Father’s commands and remain in his love. I have told you this so that my joy will be in you. I also want your joy to be complete.
John 15:10–11 — New American Standard Bible: 1995 Update (NASB95)
“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.
“These things I have spoken to you so that My joy may be in you, and that your joy may be made full.