Strictly speaking, psychological incapacity does not enter into the sphere of full ethical accountability, into the realm of total moral responsibility – although neither does it altogether free someone thus incapacitated from all ethical liability or moral burden. Reason: The mind and will functions of those afflicted with such a personal malady have no complete control of all his or her actions or actuations, but neither are their effect insane. When the human psyche is incapacitated, it is reasonable to assume that the person concerned does not completely like or dislike what he or she does.
The above observation has particular relevance to marriage especially in conjunction with essential spousal and/or standard conjugal agenda. For one reason or another, a disabled psyche causes a deficit in the right understanding of and compliance with what is demanded and expected of him or her as a spouse, as a conjugal partner. The conclusion from all these observations can be thus summed up: Woe to someone psychologically incapacitated in the event that the same gets married! Woe to his or her spousal or conjugal mate! Woe to the marriage itself!
What are the more common indications of psychological incapacity for marriage intents and purposes on the part of an individual afflicted by such a personal malady? These: There is marked ambivalence, inconstancy or hesitancy. There is serious immaturity, irresponsibility or undependability. There is grave impulsivity, unpredictability or uncertainty. And these are certainly not the credentials for entrance into the Marriage Covenant, definitely not the potentials for the fulfillment of the crucial and lasting obligations therein.
It goes on without saying that psychological incapacity for eliciting sound and valid matrimonial consent is the standard effect of a given personality disorder which is in the area of psychiatry. The moment someone is or was a patient of a professional psychiatrist/s, this can be anything but good news for the affective or emotional well being of the person concerned. And the same personal liability can also be anything but the right credentials for contracting marriage.
But then, properly speaking, the above psychological incapacity or incompetence of the human psyche constitutes neither the credentials for entering the priesthood or the nunnery. This is sad but true. It would be a disaster not only for the subject party concerned but also for the said institutions. This is certainly not intended to belittle those with an impaired psyche, but neither is it right and just to say that they are fit and able candidates for the religious life.
What then could/should they do? This: Remain single for life, specially so when someone finds it quite hard to choose a spouse, becomes ambivalent towards marriage, gets accustomed to being single into his or her advanced age – such as half a century or more.