The important qualities any disciple of Jesus needs (now or in the past) are:
available: A disciple must be available, able to be used.
teachable: God is always teaching His disciples. About Himself and themselves.
faithful: A good disciple must be faithful to do as taught.
They needed to learn faith, trust, and believe.
Thomas, who was not there when Jesus appeared to all His disciples. He said that He wouldn't believe Jesus was back unless he touched His wounds.
Koalas are not needed but, very important to the fox.
its important because they are needed
Jesus knew His time on earth would be brief. He needed the twelve men He picked as disciples to carry on the good news after His resurrection and ascention. The twelve were given the gift of the Holy Spririt through which they preformed miracles just as Jesus did.
Strictly speaking, he did not. He could have done the whole thing without any help at all. It was the other characters who needed Aslan, and becoming his disciples was to their benefit. So he included them in his work and gave them tasks to do.
it was important because they needed to know how to count
Beautiful. Important. Perfect. Needed.
Look into the Bible in the book of Acts Chapter 2. You will find the disciples of Jesus received the Holy Spirit on the day of pentecost. You will see that when asked what was going on by people that were in the city, Peter a disciple of Jesus stood up with the other disciples and told the people what was happening. They also told them what they to needed to do to be saved. So though Jesus told the disciples what to do, it was Peter who preached the 1st lesson on salvation. This is where "pentecostal" belief started.
It is just important to recover deleted files that are needed.
cellulose important in the diet as a source of needed fiber
Aqueducts are important because they bring water to where it is needed for consumption.