The most influential factor in people's support or opposition was personal experience. And everyone had a different story to tell the committee.
There was the woman who supported a law change because she had once witnessed the bloody aftermath of a terminally ill neighbour who had killed himself. There was the young student who survived Stage 3 cancer and concluded that seriously ill people were not capable of deciding about the future. And there was the high-ranking Dutch official and fervent believer in euthanasia who changed his mind after witnessing thousands of cases.
One of the most common arguments raised by opponents is the risk of the slippery slope - that laws could gradually be loosened to allow relatively healthy people to be eligible for an assisted death.
Whether Seymour's bill progresses will come down to how broad its scope is, and whether he can convince his colleagues that the safeguards go far enough.
His legislation is based on former Labour MP Maryan Street's bill, but goes further by making non-terminal patients eligible for a medically-assisted death. That has caused even the Greens - the only party with a pro-euthanasia policy - to pause before deciding how its MPs will vote.
MPs come under intense pressure on conscience issues, not least in election year. That is evident in the fact that Labour and National have washed their hands of the euthanasia issue. They'd be more than happy if the bill did not come up in the thick of the general election.
Whatever Seymour says, the long, fraught path to legalisation has only just begun.