What does it mean for us that Christ returned in 70 AD?
I think one of the keys to understanding what the Parousia means is the 40 year wilderness trek of the Hebrews.
In a sense you could say that the entire narrative of the scriptures is given in the torah.
The bible is full of foreshadowings.
Let us for now focus on the similarities between the desert wandering Hebrews and the believers extant in the period from Christ’s crucifixion, resurrection and ascension to the parousia/2nd advent.
The Hebrews had been promised a land. The entering into this promised land is depicted in Joshua and is inaugurated with the passing through the Jordan and the placing of the stones (yes plural) that had the law written on them onto the altar made of unworked stones.
One parallel that immediately springs to mind is that both groups were looking for a Promised land.
Just as the Hebrew’s were given a set of rules that would become truly applicable only when they entered the promised lands (no cities of retreat in the wilderness) so the believers were given the truth concerning the law (which is to say they were told what the true and hidden purpose of the then dying but not yet dead covenant was) and established in the doctrines of grace and justification.
Not only that but they were informed through the prophets and apostles what the new covenant was going to be.
Whereas the mosaic covenant was a set of laws or standards outside of people that the people had to – at least try to – conform themselves to now the law was to be written on their hearts.
I believe the distinction between the old and new covenant can be summed up as:
Old covenant = Try to make yourself righteous
New covenant = God will make you righteous
The parousia was Christ returning to destroy that which was faltering. It was his coming in wrath and judgement upon Judah.
It was the full flowering of the fruit of sin in Israel. The sin that was brought to maturity through the law to bear fruit unto death.
It was the destruction of the vessel of wrath…
To see all this just read romans. It tells you the import and function of the law.
Jerusalem and Jericho bear the similarity that they both had to be destroyed before the elect could enter into the Kingdom/promised land.
“The Holy Spirit is signifying this, that the way into the holy place has not yet been disclosed while the outer tabernacle is still standing, which is a symbol for the present time.” Hebrews 9:8