So, are you asserting that the standard of behaviour God requires of those who have Jesus Christ, the Holy Spirit and a renewed purified spirit is less that what He expected of those who did not have Jesus Christ, the Holy Spirit and a renewed spirit under the old covenant?
This seems to be the naturally occurring question that arises from the realization that we are not under the requirement for performance-based salvation. The many, many religions who today demand performance-based salvation and retention of said salvation that they teach about, this is the outflow from that doctrinal basis that is to pervasive among the denominations and cults.
When you speak of behavior, that, to me, bring forth the requirement for performance. Behavior, most generally, plays into the realm of our efforts and conduct in relation to perceived moral standards, requirements and Law.
When Paul spoke of the only basis for our salvation through the Gospel of Grace today, he was careful to divorce it from anything to do with our "behavior" in the broadest sense of that term. Yes, we are indeed to be subject to the guidance and direction of Holy Spirit given that we are sealed by Holy Spirit upon the basis of our faith in the death, burial and resurrection of Christ on the third day, according to the scriptures, for our redemption and cleansing of our sins in the past and in the future.
So, what matters is what was placed upon them back then before the Gospel of Grace, and what it placed upon us today. That they are different doesn't differentiate any of us apart from the ancients as anyone being more or less beholden to moral conduct. They, at that time, were required to DO by their efforts given that they were not filled by Holy Spirit. We today, guided and sealed by Holy Spirit, will, by nature through the guidance of that same Holy Spirit, will conduct ourselves willingly, walking by faith, working out our salvation with fear and trembling, but not in the manner as is presumed by the those who have sold themselves out to the system of work-based salvation.
Does that adequately answer your question? If not, then I would have to ask about the basis and perspective from which you're asking the questions rather than trying to guess at it, given the plethora of variants so many harbor in their understanding about works-based salvation versus walking by faith and everything in between.
MM