- DN 23“Even though Master Kassapa says this, still I think that there’s no afterlife.”
“Can you prove it?”
“How, exactly, chieftain?”
“Well, I see ascetics and brahmins who are ethical, of good character, who want to live and don’t want to die, who want to be happy and recoil from pain. I think to myself, ‘If those ascetics and brahmins knew that things were going to be better for them after death, they’d drink poison, slit their wrists, hang themselves, or throw themselves off a cliff. They mustn’t know that things are going to be better for them after death. That’s why they are ethical, of good character, wanting to live and not wanting to die, wanting to be happy and recoiling from pain.’ This is the method by which I prove that there’s no afterlife.”
“Well then, chieftain, I shall give you a simile. For by means of a simile some sensible people understand the meaning of what is said.
Once upon a time, a certain brahmin had two wives. One had a son ten or twelve years of age, while the other was pregnant and nearing her time. Then the brahmin passed away.
So the youth said to his mother’s co-wife, ‘Madam, all the wealth, grain, silver, and gold is mine, and you get nothing. Transfer to me my father’s inheritance.’
But the brahmin lady said, ‘Wait, my dear, until I give birth. If it’s a boy, one portion shall be his. If it’s a girl, she will be your reward.’
But for a second time, and a third time, the youth insisted that the entire inheritance must be his.
So the brahmin lady took a knife, went to her bedroom, and sliced open her belly, thinking, ‘Until I give birth, whether it’s a boy or a girl!’ She destroyed her own life and that of the fetus, as well as any wealth.
Being foolish and incompetent, she sought an inheritance irrationally and fell to ruin and disaster. In the same way, chieftain, being foolish and incompetent, you’re seeking the other world irrationally and will fall to ruin and disaster, just like that brahmin lady. Good ascetics and brahmins don’t force what is unripe to ripen; rather, they wait for it to ripen. For the life of clever ascetics and brahmins is beneficial. So long as they remain, good ascetics and brahmins make much merit, and act for the welfare and happiness of the people, for the benefit, welfare, and happiness of gods and humans. By this method, too, it ought to be proven that there is an afterlife.”
I repeat this important line in bold and large font.
Good ascetics and brahmins don’t force what is unripe to ripen; rather, they wait for it to ripen.
The only exception is that you're an Arahant (you're blameless) and thus do not generate karma,and cannot live anymore for whatever reason, perhaps very poor health. Aside from that, if you are not an Arahant, then committing suicide is throwing away a very very rare rebirth. If you're not an arahant and you're near death already, perhaps from a disease, then I can understand suicide, but otherwise I would say that the suttas agree that suicide is a waste of human life.
I realize this may stir up controversy or drama, but that's what the suttas say.