Human life consists in mutual service. No grief, pain, misfortune, or “broken heart,” is excuse for cutting off one’s life while any power of service remains. But when all usefulness is over, when one is assured of an unavoidable and imminent death, it is the simplest of human rights to choose a quick and easy death in place of a slow and horrible one.

Charlotte Perkins Gilman (1860-1935) American sociologist, writer, reformer, feminist

Suicide note (1935-08-17)
    (Source)

Gilman, an advocate for euthanasia, took her own life through an overdose of chloroform, after having been diagnosed with incurable breast cancer in January 1932. In both her autobiography and her suicide note, she said she "chose chloroform over cancer."