One could take that to mean that Jesus died to forgive us when we sin, but it doesn't really say that He is the one that helps us not to sin.
When Jesus was knew the time was coming for His crucifiction, He told His apostles that He would send a comforter and helper to them. Until Jesus death and resurrection, the Holy Spirit was not available to us. It is only with Jesus death on the cross for sins that we receive the Holy Spirit when we are born-again.
That is one HUGE difference.
John 14:15-20
“If you love me, you will keep my commandments.
16And I will ask the Father, and he will give you another Helper, to be with you forever,
17 even the Spirit of truth, whom the world cannot receive, because it neither sees him nor knows him. You know him, for he dwells with you and will be
g in you.
18“I will not leave you as orphans; I will come to you.
19Yet a little while and the world will see me no more, but you will see me. Because I live, you also will live.
20In that day you will know that I am in my Father, and you in me, and I in you."
John 14:25-28
“These things I have spoken to you while I am still with you.
26But the Helper, the Holy Spirit, whom the Father will send in my name, he will teach you all things and bring to your remembrance all that I have said to you.
27Peace I leave with you; my peace I give to you. Not as the world gives do I give to you. Let not your hearts be troubled, neither let them be afraid.
28You heard me say to you, ‘I am going away, and I will come to you.’ If you loved me, you would have rejoiced, because I am going to the Father, for the Father is greater than I."
We also have been given the mind of Christ as well as have had the scriptures written upon our hearts. Both of these things could have only occurred after Jesus death, because until we were reconciled back to God, God could not reside within us.
1 Corinthians 2:10-16
"these things God has revealed to us through the Spirit. For the Spirit searches everything, even the depths of God.
11For who knows a person’s thoughts except the spirit of that person, which is in him? So also no one comprehends the thoughts of God except the Spirit of God.
12Now we have received not the spirit of the world, but the Spirit who is from God, that we might understand the things freely given us by God.
13And we impart this in words not taught by human wisdom but taught by the Spirit, interpreting spiritual truths to those who are spiritual.
14 The natural person does not accept the things of the Spirit of God, for they are folly to him, and he is not able to understand them because they are spiritually discerned.
15The spiritual person judges all things, but is himself to be judged by no one.
16“For who has understood the mind of the Lord so as to instruct him?” But we have the mind of Christ."
Hebrews 10:14-18
And the Holy Spirit also testifies to us; for after saying,
15The Holy Spirit also testifies to us about this. For after He says:
16"This is the covenant I will make with them after that time, says the Lord. I will put my laws in their hearts, and I will write them on their minds."
17Then he adds: "Their sins and lawless acts I will remember no more."
18And where these have been forgiven, sacrifice for sin is no longer necessary. "
So, we have many advantages being part of the New Covenant (with the death of Jesus and grace) in comparison to trying to be obedient to the Old Covenant (Law of Moses).
Only through the death of Jesus could:
* We be reconciled back to God (which enables the Holy Spirit to reside in our hearts)
* We been given the mind of Christ
* We are given the gift of Salvation by grace (free gift)
None of this was available during the Old Testament times. Jesus set us up for success, to walk with Him.