The whole enchilada. A whole new world. He's got the whole world in his hands. Whole is an adjective, a word used to delineate or narrow the meaning of a noun.
So what? Why delineate? Why narrow? Why specify? Well, because that makes the noun better. It clarifies what is being communicated. It gives more structure.
I myself hate being delineated. I don't like being limited or narrowed. I want to be free as a bird, happy as a clam, a true rolling stone. But that's not the best thing for me! My task is to be specified and focused. A focused spray of water is more powerful. A focused beam of light? More powerful than a saw. A delineated woman? More lovely than the morning.
Oh Lord, may I be wholly yours. Delineate me, limit, narrow, focus me. Make me powerful to wield your double-edged sword to make everything you've given me to be wholly yours.