Gibb's rules: No. 13 Never ever involve a lawyer; No. 27 There are two ways to follow someone - First way, they never notice you - Second way, they only notice you; No. 44 First things first - hide the women and children; No. 51 Sometimes, you're wrong.
When Tony speaks to Gibbs and says "within you and without you, that's a U2 song", he means "with or without you". "Within your and without you" is a George Harrison Beatles song.
Referring to Gibbs' rules both Tony and Abby say that if the 40's are in play something bad is going down. Rule #40: If it seems like someone is out to get you, they are. Rule #42: Never accept an apology from someone that just sucker punched you. Rule #44: First things first, hide the women and children. Rule #45: Clean up your own mess.