Is it possible that if a priest is in a disordered state that it affects his capability to act as Christ in providing the sacrament of the Eucharist?
I don’t know, but there are any number of ‘disordered states’ which could affect a priest (or any person indeed) at a particular moment in time. The disordered state to which you refer, I expect, is that of having homosexual tendencies, not actually
practicing homosexuality. Firstly, such a priest is, as much as any other priest, celebrating the Eucharist in a state of grace. The Church does not consider his ‘tendencies’ to be sinful. However, I have just come across this explanation in a Catholic Answers book that I have: it explains that the very fact that a priest has been ordained validly means that the Masses he celebrates are valid - even if the priest was in a state of sin…‘they would not receive the graces from the sacrament of Holy Orders, or from Masses celebrated, until their sins had been forgiven in the sacrament of Penance.’ This isn’t a way for the Church to ‘get around’ the issue of homosexuality in the priesthood since the candidate at the seminary would have been screened for physical & psychological health, morals, doctrine and piety and soforth.
We cannot assume that a person with a disorder will necessarily be unable to carry out their duties properly - this again, would be an unfair stereotype. Such stereotypes lead people to label people according to the disorder, rather than seeing the person who happens to be afflicted with a disorder. In fact, in Ireland at the moment, there is a campaign to try to get people to stop labelling those with mental health issues according to their illness and rather to see the
actual person.
You refer further on to certain sins which are natural failings and which can be overcome - such as alcoholism. Then you separate homosexuality from these as it’s an ‘unnatural disorder’ - surely any disorder is unnatural otherwise it wouldn’t be a disorder. Excessive alcohol consumption and gambling
are not natural failings - and granted, they may be overcome, but like anyone who has suffered from an addiction, they will battle the addiction for the rest of their life. There is a difference too, in that, a priest, knowing an action is wrong- such as excessive alcohol consumption, a sexual relationship - still acts on it, and is therefore in a state of mortal sin. On the other hand, a priest with homosexual tendencies, who realises to act on his tendencies would be wrong, but doesn’t, by will and prayer, has saved himself from entering into sin. I hadn’t heard of the priest Fr John Harvey, but he has councelled homosexuals for many years and he has shown that homosexuality can be completely overcome with the combination of counselling, an active spiritual life, and frequent attendance at the sacrament of Penance and Holy Communion. Also, do you really think lust is more common with an active homosexual than it is with a heterosexual priest who doesn’t put any value on the vow of celibacy he made before God - both are just as capable of sinning, just as both are equally capable of rejecting sin by honouring their vows to God of serving Him first.