"Spiritual maturity" can be accessed from a number of points of view.Those who place a great deal of importance on organized religion will likely say that maturity is based on years of church attendance as well as rank or titles one has earned inside the church structure.By this standard the BTK killer,a mass murderer, certainly was near the zenith of his spiritual maturity due to the years of his faithful church attendance and his elected position of church president.In fact because he was the church president ,he had the keys to the church entrance doors which allowed him to bring one of his victims into the church late at night so that he could rape her behind the pulpit.
Another more logical definition of "spiritual maturity" is the demonstration of Jesus' love and compassion.The problem with this one is that many non-Christians and even atheists are amazingly generous in their giving and acts of charity,thus fulfilling Jesus' mandate to "be your brother's keeper".On the other hand many who call themselves Christians are remarkably uncharitable in their giving.In fact I've learned that the easiest way to make many Christians livid with anger is to mention just one word;"tithe".
It makes much more sense to adopt God's definition of "spiritual maturity".When He determines that individuals are sufficiently free of sin and most importantly,filled with an abundance of faith,He sends His Holy Spirit to them which assures them that they are finally walking on the narrow path that leads to salvation. To show us the absolute necessity of this experience,God made His own Son go through it as He transformed His Son's humanity into divinity.
So Jesus was baptized and as soon as He came out of the water, the sky opened, and He saw the Spirit of God coming down on him like a dove.
And what are the signs of this "spiritual maturity"?
1 Corinthians 12:8-10
8 To one person the Spirit gives the ability to give wise advice; to another the same Spirit gives a message of special knowledge. 9 The same Spirit gives great faith to another, and to someone else the one Spirit gives the gift of healing. 10 He gives one person the power to perform miracles, and another the ability to prophesy. He gives someone else the ability to discern whether a message is from the Spirit of God or from another spirit. Still another person is given the ability to speak in unknown languages, while another is given the ability to interpret what is being said.