Three major themes characterizing the thinking of the Second Vatican Council offer a key to the renewal it envisaged: an ecclesiology of "communio" and of the "People of God"; a philosophy of "Christian personalism" which emphasizes the personal dignity, rights and duties of each member of Christ's faithful; a spirit of "diakonia" or service as distinguishing the call to follow Christ, and especially the vocation of his ordained ministers. It is important to see the harmony and interaction between these three concepts: communion, personalism, service.