The Catholic Church was wrong about Galileo.
A bold statement, but factually incorrect.
The Church was not wrong in telling Galileo to stop asserting his scriptural interpretations as authoritative.
As has been covered ad nauseum, the Church did not have any problem with his actual scientific theories (as it did not have any problems of those before him or after him). It had problems with his theological theories that he was presenting as factual and authoritative.
Cardinal Dolan has said on Catholic Channel on XM radio that historically, the Church believed that suicide was an automatic ticket to hell, but that now thanks to new knowledge of psychiatry, that might not necessarily be the case, as one who commits suicide might be medically sick.
Well, yes and no. And perhaps Cardinal Dolan is being paraphrased here… some people believed that suicide was an “automatic ticket to hell” and may have even told people that from the pulpit, in CCD class, or whatever.
The Church teaches now as it has *always taught *that mortally sinful acts can lead to hell if one dies unrepentant.
The Church teaching on suicide has not changed. You can still read all about it under the 5th commandment in the Catechism. Copied here for convenience:
2280 Everyone is responsible for his life before God who has given it to him.
It is God who remains the sovereign Master of life. We are obliged to accept life gratefully and preserve it for his honor and the salvation of our souls. We are stewards, not owners, of the life God has entrusted to us. It is not ours to dispose of.
2281 Suicide contradicts the natural inclination of the human being to preserve and perpetuate his life. It is gravely contrary to the just love of self. It likewise offends love of neighbor because it unjustly breaks the ties of solidarity with family, nation, and other human societies to which we continue to have obligations. Suicide is contrary to love for the living God.
2282 If suicide is committed with the intention of setting an example, especially to the young, it also takes on the gravity of scandal. Voluntary co-operation in suicide is contrary to the moral law.
Willfully taking your own life is grave matter, and as a final act may be an unforgiven/unrepentant act depending on whether the other two elements necessary for mortal sin (knowledge and free will) are present.
The Church also teaches there are things that can lessen or remove culpability for such an act, in which case it is not mortally sinful by the church’s own three fold requirement of mortal sin. As the Catechism states:
2282 Grave psychological disturbances, anguish, or grave fear of hardship, suffering, or torture can diminish the responsibility of the one committing suicide.
Of course, we can know none of what is in a person’s mind. So, as the Catechism states:
2283 We should not despair of the eternal salvation of persons who have taken their own lives. By ways known to him alone, God can provide the opportunity for salutary repentance. the Church prays for persons who have taken their own lives.
So all we can do is comment on the fact that taking one’s own life is grave matter against the 5th commandment.
As we learn more scientifically, is it then possible for the Catholic Church to concede error about its teachings?
There isn’t any error in Church teaching on faith and morals.
For example, scientific knowledge of sexuality and the possibility of being wrong about marriage?
No.