“23And in that day ye shall not ask Me any thing; truly, truly, I say to you, if ye ask the Father any thing in My Name, He shall give [it] to you. 24 Till now ye asked nothing in My Name; ask ye, and ye shall take, that your joy be full.”
Jesus says His disciples do not ask Him for any thing in that day — the day of His resurrection, a day in which their joy is complete. They have no need of any thing. From that point forward, Jesus tells us, we are to ask God the Father directly for whatever we need to be joyful. And we are to take whatever it is we need directly from God, who gives us all good things for the sake of His Son, Jesus.
Jesus reminds us God loves us because we love and believe in His Son. We believe the Son comes from the Father; and we know to listen to and follow the guidance of the Holy Spirit, who emanates from the Son and the Father.
Jesus implies what we ask for should complete our joy.