In its historical phase, the Sikh religion was organised around the strong central figure of the living guru with authority passing to the Adi Granth and the wider community at the turn of the 18th Century. There is no ordained ministry, although some people (granthi, sometimes referred to as priests) are trained to read and expound the Adi Granth which lies at the centre of Sikh ritual. Sikh communities organise around temples (gurdwaras)and tend to be congregationally structured. There are also state-level organisations.