Why should we know about our reality?
The answer is (as I understand it ) that, according to Buddha, it is lack of understanding of the truth about our reality, that causes suffering to ourselves and others and allows us to carry out actions that trigger may laws of Karma and cause further problems in various life times.
So what is it that we have to understand? Well on one hand too much to easily put into words in a short post. People spend life times working it out!
But on the other hand, simply that we are energy beings living in an inter- connected energy matrix. Every action and interaction affects the matrix. Everything you do and feel has consequences, often over many life times. Understand that we are part of a great game on many levels. Play well, play honest, play kind. As Albert Einstein said “Reality is merely an illusion. Albeit a very persistent one.”
Understand this and it becomes easier to play, that is why we should know.