The righteousness of today is the mind of man. Our current world is in the state that it is because this is the world that the modern man has created. This is the world that modern thinking has created.
People believe that they belong to the correct tribe that has the correct righteousness, that their tribe is immune to the mind of man. It is not, the mind of man, the modern man, is in all of the religions and ways, it hides in a person's blind spots.
The future righteousness is also the future where the future world reflects this righteousness, and there is harmony in the mind of man. This absolute way is first acknowledged by the 10 Commandments, and later defined by Jesus Christ. This way was also spoken about by those who see the future, called the 'prophets', but those types often have trouble articulating their understanding and meaning.
This future righteousness is absolute, it says, "You will not murder." Some time later, Christ adds, "You will love your enemies". Then He adds statements, "Pray for those who persecute you and who are against you."
Man's righteousness is conditional and based upon the mind and opinions of man. Man's mind says, "Yes, this is true, unless.." It says, "Yes, you should not murder, unless.." "Yes, we should love our enemies, unless.. they wrong us." "We should not murder, unless they are those wicked people."
This is what the mind of man does and it is in every church and organization and group in the world because it is inside of us. These conditional statements we add to the way instructed is why the Bible says that all throughout time people have refused to listen, how they are told as the most famous example, not to build idols, and they build idols right after instructed. It works just like this, "Yes, we should not build idols above God. Unless it's for a good reason!"
There is no commitment to the principle outlined, and so they are neither here nor there, one might be this way one moment, and that way the next.
If this is the case, a person may desire to follow God, but they are unable, because they have made no commitment to honor this. Of course this must come out of a loving devotion for goodness and love itself, for the love of love, for goodness' actual sake, but that is beyond the scope of this writing.
Even if they have the hearts desire to be good, one must commit to something absolute to hold onto it, otherwise the mind has the power to selectively choose when and where it decides that the word of God applies.
It is easy to fall into one's own sense of charged righteous fury and do anything in the name of God, both God's and our own charge of passion feel right and just to us in the moment. While riding the high of that passion, man often uses God to achieve man's righteousness.