The History is Now and the Now is History

In Wallace Stevens' "A Postcard from the Volcano," he wrote:
"And least will guess that with our bones
We left much more, left what still is
The look of things, left what we felt

At what we saw." (7-10)
He expresses how the present is made up of the past, and even though one may not notice, without the past there is no present. What people left before are important, and how they come out to appear in the present is intriguing. However, a thing cannot be described by the past only. It includes its past, its present, its potential future, the different opinions about, the different sides of it, and its opinion. It may be that, to completely understand the object, one have to take account of every single piece--not leaving out anything. Even though everybody have different views and opinions, none of them are solely wrong. But may does not mean that everything is right. Then what is right and what is wrong? If one thinks tomatoes are nasty and one thinks they're great, which is right? Can both be right? Are there such things as right and wrong? Everything has pros and cons. Is anything really good or bad? Is it possible to categorize everything in the two groups or would they all come out neutral overall? Is it possible to find out every single thing about a thing? Humans only have limited knowledge and limited space to use it. One may not know, for an example, why their house was built, why the house is of that appearance, what had happened in the house before, the significance of the material, the place, etc, who built it, etc...but he/she still lives in it. Does it matter to know every single aspect of something? How much do we have to know in order to live in this world? To what extent of knowledge do we not have to acquire so we would not be "ignorant"? We only have limited knowledge and we have to work with it. There should be a meaning and some kind of essence in the limit. However, it is important to remember how the present is nonexistent without the past...and that is one of the reasons we learn history in school!!!