There was one tree that would change the perfect immortal human in order to give them the ability to know what is good or evil, but also made them mortal. After that choice, they were barred from the garden and it has not been found since. There is a tree of life which is forecast to be free for the picking at some point in the future. I am not sure if we will ever see the tree of knowledge (of good and evil) again.

Another note, all are expressing opinions today seemingly knowing what is good or bad, love or hate (hate-speech), which are totally subjective. Each subject has their own good and evil judgement.