“No weapon is as dangerous as an idea. A weapon will kill you in that moment. A bad idea can kill you for a lifetime.”
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Marcus Orelias 28
American actor, rapper, songwriter, author and entrepreneur 1993Related quotes

Counterterrorism and Cybersecurity: Total Information Awareness (2nd Edition), 2015

As quoted in the Jakarta Globe http://www.jakartaglobe.beritasatu.com/features/legendary-director-garin-nugroho-shares-insights-experiences-singapore-masterclass/, Singapore International Film Festival (March 12, 2017)
Essays on Education quoted in The New York Times (24 February 1959).
Variant ending: The source of better ideas is freedom. The surest path to wisdom is liberal education.
Context: Books won't stay banned. They won't burn. Ideas won't go to jail. In the long run of history, the censor and the inquisitor have always lost. The only sure weapon against bad ideas is better ideas. The source of better ideas is wisdom. The surest path to wisdom is a liberal education.

“Kill your doubt with the coldest of weapons: Confidence.”
Lyrics, Light Grenades (2006)