“Suicide is painless.”
Though covered by Manson, this is actually a lyric to "Suicide Is Painless" written by Mike Altman for the movie M*A*S*H (1970); the music (written by Johnny Mandel) later provided the theme music for the M*A*S*H TV series.
Misattributed
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Marilyn Manson 78
American rock musician and actor 1969Related quotes

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Argument on the murder of Captain White (1830)

Source: The Boy Crisis (2018), pp. 276

BBC Monitoring (7 April 2003) "Iraqi information minister denies presence of US forces in Baghdad" (as US forces reported entering the center of Baghdad)

“Suicide is a permanent question.”
Out Came the Sun: Overcoming the Legacy of Mental Illness, Addiction, and Suicide in My Family

“Drunkenness is temporary suicide.”
1930s, The Conquest of Happiness (1930)

Source: The Presence of the Kingdom (1948), p. 28

“A murderer is only an extroverted suicide.”