While suicide is grave matter, the Catechism also notes that in order for a person to commit a mortal sin, three conditions must be a met: that the sin is grave matter, and that the person commits the sin with "full knowledge and deliberate consent."
There could be mitigating factors, such as mental illness or some other kind of great distress, that might relieve a person of at least some culpability in committing suicide, Cloutier said.
The hope for salvation
Even given the gravity of suicide, Christians should always hope in the love and mercy of God in cases of suicide, Scott Hefelfinger, a moral theologian and assistant professor of theology at the Augustine Institute in Denver, told CNA.
"If we lose all hope with respect to this person's salvation, we could in fact be sort of repeating the same emotional disposition of despair that afflicted the person who did commit suicide. So we're counseled to hope rather than despair," he said.
"We put our trust in God's mercy."
Furthermore, Cloutier said, the Catechism itself is "pretty straightforward" in saying that those who commit suicide are not necessarily denied eternal salvatinon, because the state of their mind and soul at the time of committing the act is a factor.
If the person was in "some kind of emotional stress, or depression, or other various ways in which a person's emotions get in the way of fully knowing what they're doing," their responsibility is at least somewhat mitigated, he said.
Fr. Edward Krasevac, OP, is a professor of theology, and the theology department chair at the Dominican School of Philosophy and Theology in Berkeley, California.
Krasevac said that because the will to live is such a basic human instinct, it seems possible that many cases of suicide are committed by people who are influenced by serious clinical depression or other mental illnesses or psychological factors that would impair their judgment and mitigate to at least some degree the consent of their will.
"People who are clinically depressed don't think straight, they can't think straight," Krasevac said.
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He added there could be other mitigating factors in a person's life, such as fear of the pain of death, or the fear of what is going to happen to them if they stay alive, such as a person "facing the rest of their life in not a good prison situation, losing everything they ever had, not being able to deal with life in prison...these are what we call modifiers of responsibility."
"So in many cases of suicide, a person's responsibility is seriously diminished," he said. "[In such a case] it's not subjectively mortal sin even though it may look like it from the outside and it is objectively a mortal sin."
Another reason to hope is that a person could have repented of their actions in the moments before their death, Hefelfinger noted.
"In the case of someone who, let's say is culpable of the act of suicide, and they begin this process. Well, usually there's some suffering involved, and usually death doesn't come about instantaneously," he said.
"And so, God's mercy doesn't need a very wide crack to get through. I think there are always these opportunities prior to death, in the split second before death, where we certainly do not want to rule out the possibility of God's mercy," he said.
"And again, we say this without in any way diminishing the gravity of the act. It's the gravity of the act that makes us lean on God's mercy so much, so we turn our attention to that and pray for that so greatly."