“If a man remains [abides, stays, continues, dwells, lives] in Me and I in him, he bears [brings forth] much fruit; apart from [without] Me you can do nothing.”
Without life-giving sap from the vine itself, a branch dries up, dies. Eventually the dead branch falls to the ground, is gathered and burned.
Jesus tells His eleven disciples to ask for whatever they wish, and it is given to them. (John 15:7) The caveat, of course, is that because they function as branches to His Vine, what they wish falls in line with what He wishes as what He wishes falls in line with what God the Father wishes.
Jesus teaches His disciples to pray,
“Our Father in heaven, hallowed be Your Name, Your kingdom come, Your will be done on earth as it is in heaven.” (Matthew 6:9-10)
“Be perfect, therefore, as your heavenly Father is perfect.” (Matthew 5:48)