Every art and every inquiry, and similarly every action and choice, is thought to aim at some good; and for this reason the good has rightly been declared to be that at which all things aim.
                                                                                    
                                        
                                        
                                        
                                        
                                                                                
                                            
                                                
                                                    
                                                        Nicomachean Ethics, bk.1, ch.1,1093 (translated by Sir David Ross).