In the book To Kill a Mockingbird a part of the plotline is an upcoming court trial of a black man. His defense attorney is a father of two who is talking about the future case with his young daughter. Most people in town are not pleased with him defending this man. He says to her:
This case, Tom Robinson’s case, is something that goes to the essence of a man’s conscience—Scout, I couldn’t go to church and worship God if I didn’t try to help that man.”
I don't understand what "go" means in this context. The only definition I could find that fits is:
(intransitive) To belong (somewhere).
Synonyms: belong, have a place
My shirts go on this side of the wardrobe.
This piece of the jigsaw goes on the other side. (Wiktionary)