As children reading the New Testament can be hard to understand. The verse about tree bearing fruit has more meaning the older you get and the more mature in Christ you become. In John it talks about the Vine and the Branches,“I am the vine; you are the branches. If you remain in me and I in you, you will bear much fruit; apart from me you can do nothing. If you do not remain in me, you are like a branch that is thrown away and withers; such branches are picked up, thrown into the fire and burned. John 15:6-7 . If we get out of the word and away from the path that God has for us we become a vine that is useless. Only remaining close to the Lord can we avoid this. Have you seen a tree uprooted from a storm? It doesn’t take long for it lose its color and dry up. Eventually it will become useless. Our roots have to be firmly planted in the Word of God or we could risk becoming a tree that withers because it easily uprooted.
“I am the true vine, and my Father is the gardener. He cuts off every branch in me that bears no fruit, while every branch that does bear fruit he prunes so that it will be even more fruitful. You are already clean because of the word I have spoken to you. Remain in me, as I also remain in you. No branch can bear fruit by itself; it must remain in the vine. Neither can you bear fruit unless you remain in me. John 15:1-4