Imagine building a house. You enlist the best architect to put your vision down on paper and get the help of engineers and builders to assist you in putting your project together. You would expect a normal sequence of events to occur that most houses would go through when being built. Planning, design, clearing land, laying the foundation and so on all occur one after the other until your home is complete.
What would happen then, if the bricklayers turned up before the foundation was laid? This would be an obvious fault in the sequence of events and the house would surely fail.