Answer:
because sometimes they tell us things that we didn't know things that are in the past but just when the stories are real.
To use your example, cede does mean to go. However, "recede" means to draw back or go back. Think of an ocean. What does the tide do at certain times? It recedes!
So re- is the best answer.
In lines 29-34 Shylock gives his reason.
"Yes, to smell pork; to eat of the habitation which your prophet, the Nazarrite, conjured the devil onto! I will buy with you, sell with you talk with you, walk with you and so following; but I will not eat with you, nor pray with you."
Shylock's reasons are to do with his own religious beliefs.
