We are not able to anything.
We can't keep the law or commandments.
So, God did.
He fulfilled all that for us, and we are then released from it.
Everything that God requires of us, so that He can accept us, HE fulfilled Himself as Jesus.
You're limiting God-
of course we can keep the law or the commandments, by the Spirit, and
only by the Spirit. The law He gave us was by no means
wrong, it's based on
love which is why the greatest commandments fulfill the law. He wouldn't give man laws that aren't proper to his nature, and which are impossible to fulfill, only to turn around and
blame man for
not fulfilling them.
The lesson man must learn is that the law cannot be fulfilled
apart from God. God can accomplish in us what we cannot accomplish on our own. And this is how it
should be because man was made for communion with God and for the righteousness which is intrinsic to that relationship. "Apartness" from God, first of all, is man's primary and basic injustice-or sin.
"Apart from Me you can do nothing" -John 15:5. So the New Covenant prophecy of Jeremiah 31:33, which is quoted in Hebrews 8 & 10:
“I will put my law in their minds
and write it on their hearts.
I will be their God,
and they will be my people.
Phil 3:9 provides more understanding here:
“…not having a righteousness of my own that comes from the law, but that which is through faith in Christ—the righteousness that comes from God on the basis of faith.”
This faith is more than only believing, it implies relationship with God. So Jeremiah 31:34 continues:
“No longer will they teach their neighbor, or say to one another, ‘Know the Lord,’
because they will all know me,
from the least of them to the greatest,”
declares the Lord.”
The man who's been made righteous by God can fulfill the law without even needing to
know the law, without being “under the law” IOW. He’s under grace:
"But now the righteousness of God has been manifested apart from the law, though testified to by the law and the prophets, the righteousness of God through faith in Jesus Christ for all who believe." Rom 3:21
“...just as sin reigned in death, so also grace might reign through righteousness to bring eternal life through Jesus Christ our Lord.” Rom 5:21
As Luther once wrote:
"We are not made righteous by doing righteous deeds, but when we have been made righteous we do righteous deeds." And whether he thought so or not, we
must have and practice this righteousness:
"Therefore, there is now no condemnation for those who are in Christ Jesus. For in Christ Jesus the law of the Spirit of life set you free from the law of sin and death. For what the law was powerless to do in that it was weakened by the flesh, God did by sending His own Son in the likeness of sinful man, as an offering for sin. He thus condemned sin in the flesh, so that the righteous standard of the law might be fulfilled in us, who do not walk according to the flesh but according to the Spirit." Rom 8:1-4
“
Therefore, brothers and sisters, we have an obligation—but it is not to the flesh, to live according to it. For if you live according to the flesh, you will die; but if by the Spirit you put to death the misdeeds of the body, you will live.” Rom 8:12-13
The most basic problem with man, the essence of the state sometimes known as "original sin", is alienation from God, the state we're all born into, characterized as our being lost, dead, sick, etc.-and the reason man must be found, healed, raised to newness of life, "born again" or "born from above". Jesus came to reveal the true God, so that we may believe in and be reconciled with Him.
"Now this is eternal life: that they know you, the only true God, and Jesus Christ, whom you have sent." John 17:3