Hebrews 12:4 you meant.
And I think it means that they haven't been through the worst if trials and chastening yet. They need to be prepared for more.
Yes thanks for putting me right, it was Hebrews 12:4 .... Ye have not yet resisted unto blood, striving against sin.
It means that you have not yet suffered and denied yourself, turning away from the lusts of the flesh, Jesus suffered everyday denying his fleshly will and he never sinned. Some look the part and say all the right words but their not partaking in the sufferings of Christ, denying themselves, baring their crosses and following Jesus. This is shedding the blood, it's living it out, denying our sins and taking whatever is put before us and suffer it, and by doing this we deny Satan.
And Jesus shed his blood, he lived it out, every minute of every day, denying his will and suffering to please God, and it says in his suffering he learned obedience. And we, when we deny ourselves to please God we learn to obey. And through that obedience and self denial comes strength and power in the spirit. Because we're not living to please ourselves but living to please God and as the spirit shows us our sins within our hearts we are to strive to deny them daily, fighting against Satan with the strength of Christ through the spirit and we have a perfect example follow, a true way perfected in Christ Jesus who laid down his life to bring us the living word of God, dead to his flesh and having nothing of this world in him he brought the word of God with power through the fullness of the spirit showing us the complete image of God through his life, giving us the love, mercy and compassion of our holy loving merciful father and through denying himself he was able to reconcile us to God and save us through his life and he came preaching to us the gospel of salvation.
It says that Jesus came by water and by blood, this is by the word of God and he lived it out in the flesh, teaching and showing us the only way back to God. He poured out his life.
If we are shedding our blood and resisting sin, then we are truly following Jesus. Living it out and denying our flesh and partaking in the sufferings of Christ to please God. And through Christ, God will bless us with the strength to overcome through his holy spirit within. It's easy to say I repent, but true repentance is to turn from that sin and suffer and deny it and sin no more. God wants us cleansed within, and the holy spirit can't clean a heart that is still full of self will and the love of the world and fleshy lusts. We have to be willing to die the death so that Christ can live through us and we are then through him, baring witness to the truth, and bringing the light of Christ to others.
To to resist unto blood/shed our blood, is to live it out and strive against sin and deny our fleshy lusts and bare whatever is set before us and partake in the sufferings that come with it and show love and mercy in return, and in doing this we follow Jesus Christ and he, through the spirit will strengthen us to overcome. Without him and the holy spirit of God, we have no hope.
If we're not denying ourselves, and we are not baring our crosses, then we're not worthy of Christ and we're still dead in our sins.