 The issue is more complex for priests.As a celebrant, a priest is, for the fullness of the sacrifice of the Mass, absolutely required to receive under both species.On 24 July 2003, the Congregation for the Doctrine of the Faith stated, "Given the centrality of the celebration of the Eucharist in the life of a priest, one must proceed with great caution before admitting to Holy Orders those candidates unable to ingest gluten or alcohol without serious harm."