Every hour wounds. The last one kills.

gaiman-last-one-kills-wist_info-quote

Neil Gaiman (b. 1960) British author, screenwriter, fabulist
American Gods, epigraph (2001)
    (Source)

Gaiman notes this as an "old saying." It is frequently found on sun dials or other clocks, sometimes in Latin. Variations:
  • "All hours wound; the last one kills."
  • "All the hours wound you, the last one kills."
  • "They all wound; the last one kills."
  • "Vulnerant omnes, ultima necat."
  • "Omnes vulnerant. Postuma necat."