Animals born into captivity know nothing of life but captivity. Their nature is to be wild, but they've never actually experienced it so they never know how truly satisfying it is. Their lifestyle doesn't quite match up with their nature, but they never understand their nature to live that way. When an animal raised in captivity is offered release, often times it is scared. It is hesitant to take the freedom it is being offered because it is new and it's a change and it's scary. So it stays. It doesn't take the freedom that it is being offered despite the fact that its nature is to be free.
I think people are like that.
Everyone is born into captivity (Romans 3:23 -- For all have sinned and fall short of the glory of God). Everyone is a sinner. We're born that way. But we're also born with the nature of being like God (Genesis 9:6 -- for in the imagine of God has God made man). Our nature contradicts our lifestyle. We're made to be free as citizens of the kingdom of heaven. But too many people are scared of that. Too many people don't understand the satisfaction and pleasure of being free in Christ. It's not just a set of rules to follow. I can say from first hand experience that obeying the law of the Lord is an absolute delight and has made my life much easier than the times when I failed to follow the law of the Lord.
America is called the "Land of the Free." Many people in America are American citizens. They are attached to the country because of their citizenship, but that does not mean that they aren't free. They are, in fact, more free than they would be in almost any other country. They are still citizens. Citizenship in the kingdom of heaven is the same thing. Pleasing the Lord is a delight and a privilege, and citizenship in his kingdom isn't a surrender of freedom, it is exactly the opposite.
Don't be afraid of the freedom that the Lord is offering you because it looks scary and unknown. Take it! It's true! It's really freedom. It is a far cry from "another list of rules." Being a citizen in the kingdom of heaven is a privilege, a delight, an honor, and a freedom.
*picture taken by: The Visions of Kai*