Let everything go where it naturally wants to go and you will always be successful. Try to force things to go the way they don't want to go and you will have nothing but failure.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .