Hebrews 4:11 Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief.
The sabbath day is a picture, God labored for six days and then on the seventh day He rested. In our case man was created on the end of the sixth day and so you begin your new life as a day of rest, but then you must labor for six days to enter into that rest on the seventh. So consider this, Jesus was crucified, dead and buried, on the sixth day, the day of creation, and then spent the entire 24 hours of the next day in the tomb, in a day of rest, on the sabbath. But then He rose from the dead on the first day of the week, the eighth day. As a result in the new creation we can labor, we can work, and this will conclude with the millennial reign which will be a thousand years, a day of rest to God. Our Christian life begins when we are crucified with Christ. This requires us to die to self, sin, the flesh and the world. We must abide in that death, but if our old man is buried and we are abiding in that death, then we can rise in the newness of life and now it is no longer I that am doing anything but Christ who lives in me. If we labor according to this pattern of faith, then we won't fall after the same example of unbelief we see in the Old Testament.
12 For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
Jesus Christ is the incarnated word of God. He is the one who is living inside of you, but that would be indistinguishable from the incarnated word of God living inside of you. In spiritual warfare the sword of the Spirit is the word of God infused with the Spirit of God. But, the way you take hold of that word is by that word being a sharp sword like a scalpel that has been a discerner of your thoughts and intents of your heart.
13 Neither is there any creature that is not manifest in his sight: but all things are naked and opened unto the eyes of him with whom we have to do.
This is the breakthrough that we must have, to learn that those thoughts and intents we are scared of being revealed are in fact common to all the creatures. When you allow the word of God to operate on you, and discern your thoughts and intents, it becomes a sword in your hand that will manifest the thoughts and intents of every creature.
14 Seeing then that we have a great high priest, that is passed into the heavens, Jesus the Son of God, let us hold fast our profession.
So you see, the incarnated word of God operating in you, is a great high priest. He passed from the earth, through the lowest parts of Hades and Tartarus, into the heavens. He has conquered every creature, not just men, but also the fallen angels and the demons. So then, when the battle is fiercest, hold fast onto Him.
15 For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin.
Jesus understands what we are going through and what we need. He can see what we are going to need before we even realize it. He is like the coach in the corner, He sees the fight we are going through and help us with exactly what we need to stand up to the opponent we are battling.
16 Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need.
Think about that boxer, he didn't go into the ring by himself. The corner men went with him. The Father, Son and Holy Spirit are our corner men. It isn't just us, all by ourselves, fighting this fight. Therefore we can come boldly unto them. In between rounds you get to sit on the stool, get some water, get blood wiped off, obtain mercy and find grace to help you in your time of need. For example, I remember the first gospel meeting I went to as a believer. Everyone in the church had been praying around the clock for this prior to the meeting, and we had brought a number of gospel contacts. However, the brother who was preaching was getting destroyed. He was losing everyone. When he sat down it was reasonable to conclude the fight was over and it had been lost. But then I had a word inside of me, and it said this is halftime. Yes, we lost the first half of this fight, but now every member can rise with a testimony and as much as we lost the first half we can win the second half. So I was the first out of my seat, not in defeat, but believing in victory. Before I had finished an older brother was also out of his seat and I felt he had the same word, that now it is up to us to turn the defeat into victory, and before he was finished there were others out of their seats. Everything changed in that instant as everyone in the congregation realized "now it is our turn". That day I saw the fulfillment of what 1 Corinthians 14:24 But if an unbeliever or an inquirer comes in while everyone is prophesying, they are convicted of sin and are brought under judgment by all, 25 as the secrets of their hearts are laid bare. So they will fall down and worship God, exclaiming, “God is really among you!”
5:1 For every high priest taken from among men is ordained for men in things pertaining to God, that he may offer both gifts and sacrifices for sins: 2 Who can have compassion on the ignorant, and on them that are out of the way; for that he himself also is compassed with infirmity.
We have many "high priests" in our life. Gus D'Amato was a high priest to Mike Tyson. Bill Belichick was Tom Brady's high priest at New England. Think of the word "high priest" referring to a mentor or coach.
3 And by reason hereof he ought, as for the people, so also for himself, to offer for sins.
These coaches are not perfect, sometimes the game is lost because the player makes a mistake, sometimes the game is lost because the coach makes a mistake.
4 And no man taketh this honour unto himself, but he that is called of God, as was Aaron.
When you are a kid you can play basketball or football and dream and train to be a great player. But no one gets to decide they will be the coach. Think of Phil Jackson or Steve Kerr, both of these coaches are great coaches who have won multiple championships and both of them played professional basketball. But they were not the stars. Steve Kerr played with Michael Jordan, Scottie Pippen and Dennis Rodman, three hall of fame basketball players. But the superstars rarely if ever are great coaches. Phil Jackson played with Walt Frazier, Willis Reed and Earl Monroe, three hall of fame players as well. In this example Moses was the "superstar" and Aaron was the sidekick who became the high priest, the superstar coach.