6 Bible Verses about Middle Age

[This is to be done] until we all [eventually] arrive at unity of the faith and full knowledge of the Son of God; at complete [spiritual] maturity; at the [full] height of Christ's [spiritual] stature. Then we will no longer be [spiritual] babies, tossed back and forth [by waves], and blown around by every wind of [false] teaching, [deceived] by the clever trickery of people using deceptive schemes.

However, we speak [divine] wisdom among people who are [spiritually] mature, yet it is not a wisdom of this current age, nor of [its] current rulers, who are coming to nothing.

[Now] we have many things to say about Melchizedek, but because of your slowness to grasp things, they are hard to explain. For certainly enough time has elapsed so that [by now] you ought to be teachers, [but instead] you are in need of having someone teach you again the basic principles of God's message. You have become people who need "milk" and not "solid food." [Note: The fundamental truths of Christianity are here figuratively spoken of as "milk," while the more advanced teaching, such as Christ's priesthood being like Melchizedek's, is called "solid food"]. For everyone who has to drink "milk" is inexperienced in the teaching about righteousness, for he is [still] a [spiritual] baby.read more.
But "solid food" is for mature people, who because of using their [spiritual] senses, have become able to distinguish good from evil.

And you [should] allow your perseverance to complete its work, so that you will be perfect and complete, [and] not lacking in anything.

So, the child [i.e., John] grew and became strong in [his] spirit and stayed in the desert until the day when he appeared publicly to the Israelites.

And the child [i.e., Jesus] grew and became strong. He was filled with wisdom and God's favor was upon Him.