Consider an atom in a molecule. How it is made up and how it maintains its relations with the other atoms is an astounding miracle. Likewise the solar system comprising the sun and the planets resemble an atom: to create atoms and regulate their movements is not easier by any means than creating the solar system and establishing the relations between the planets themselves and between them and the sun.
Similarly a cell is like an autonomous government: it has departments of its own each of which is interrelated with the others and operates under the rule of a center. It has also a ministry of finance which manages its income and expenditure. It is as if each of the cells which comprise a man's body numbering 60 million millions had the intellectual capacity of the most intelligent member of mankind. Besides there are very close and substantial relations between the cells of a man all of which operate under the rule of a single center which is the brain.
