Hebrews 5:3  “…he is required as for the people, so also for himself…”
All earthly priests have sin natures, so they must offer sacrifices for their own sins as well as for those of the people.  Christ is above that in that He is sinless.  He didn’t have to offer anything for Himself so He was able to offer Himself as sacrifice for all men.

8  “…He learned obedience by the things which He suffered”
Not that He learned of obedience or to obey, but experienced it.  We learn to obey and to be obedient by going through trials.  Christ did the same for us to show us He can fully understand what we go through.  No one can say there is the slightest hint that God doesn’t know what we experience.  He would simply because He’s God.  But He also allowed Himself to experience all suffering to show us He knows as we know.

9  “…having been perfected…”
Christ didn’t have to do anything to be worthy of what and who He is or to do for us what He did.  But He chose to do it all to show us it could be done, how we are to do it.  He had no reason to be baptized other than to associate with us.  He came as the perfect human and did all as an example for us.  He is our perfect example.

12  “…though by this time…”
The writer seems to have been on a buildup to something, but then suddenly stops and goes off on how his readers aren’t as mature as they should be.  He’ll pick back up at the end of the next chapter.

14  “…those who by reason of use have their senses exercised…”
It’s not enough to know, you have to use what you know.  The more you read God’s word and then do it, follow it, obey it, the better you get at understanding it.  Actually what you are doing is growing in your relationship with God to the point you’re in more of a position for Him to speak to you, and you’re able to hear and understand Him better.  That’s the meaning of the whole thing, to grow in our relationship with God.  To grow into the image of Christ.

I hope you enjoy reading and studying His word.  May it accomplish what He desires.  Please feel free to comment or post questions.  Thanks for reading!

Scripture taken from the New King James Version®. Copyright © 1982 by Thomas Nelson. Used by permission. All rights reserved.