'Necessary' in the Bible

For it was fitting for God [that is, an act worthy of His divine nature] that He, for whose sake are all things, and through whom are all things, in bringing many sons to glory, should make the author and founder of their salvation perfect through suffering [bringing to maturity the human experience necessary for Him to be perfectly equipped for His office as High Priest].

Now if perfection [a perfect fellowship between God and the worshiper] had been attained through the Levitical priesthood (for under it the people were given the Law) what further need was there for another and different kind of priest to arise, one in the manner of Melchizedek, rather than one appointed to the order of Aaron?

“And it will not be [necessary] for each one to teach his fellow citizen,Or each one his brother, saying, ‘Know [by experience, have knowledge of] the Lord,’For all will know [Me by experience and have knowledge of] Me,From the least to the greatest of them.

Therefore it was necessary for the [earthly] copies of the heavenly things to be cleansed with these, but the heavenly things themselves required far better sacrifices than these.