Sevens

How many wonders of the world have you seen, they say, the number is seven, but I have never seen. I know the seven deadly sins of the earth, am I guilty of any, will they destroy , and hurt? We know the days of the week number seven, many things we have, are given in sevens. I've heard if you are the seventh son, of the seventh son, then your life will be filled with pleasure, and fun. Our world has been given the seven seas, I'm trying to understand this, will you help me? I've heard of the seventh heaven, the higest by far, a name given by astrologers, studying the stars. These are the ones that I know of, but I know there's more.