If you are, or you know, a person who loves to sew, you know they own at least one pair of really expensive scissors. Wanna give them a heart attack? Break them out and pretend to cut cardboard with them, or sandpaper, or any other thing besides cloth material.
AAAAAAAH! They HATE that.
Why? Well, for a couple of reasons. First of all, those scissors were expensive and, second of all, because they need good tools, when they need them, and they need them to work properly.
You know, that's what "HOLY" is. Set apart. You see, we are like the special scissors to God. Not only were we expensive (just ask Jesus Christ how much it cost), but God needs us when He needs us and He needs us to work properly.
Look at the "Thou Shalt Nots" as -"Hey - You don't have time for all this stuff, I have a special job for you and I need you when I need you and I need you to work properly."
Look at the "I Have Commanded Thees" as "Hey - do this stuff, so you will be available to do the special job I have for you and work properly when I need you. "
"Thus you are to be holy to Me, for I the LORD am holy; and I have set you apart from the peoples to be Mine." Leviticus 20:26