“Your enemies can kill you, but only your friends can hurt you.”
“Fear not your enemies, for they can only kill you. Fear not your friends, for they can only betray you. Fear only the indifferent, who permit the killers and betrayers to walk safely on the earth.”
Lookstein, Haskel: "Were We Our Brother's Keepers?" New York: 1985.
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Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 173.
“Fear can only grow in darkness. Once you face fear with light, you win.”
Source: Life, the Truth, and Being Free (2010), p. 90
“Fear is the true enemy, the only enemy.”
Attributed implicitly to Sun Tzu by "William Riker" in the episode The Last Outpost of the TV program Star Trek: The Next Generation, but no source for this quote predates the episode's airing in 1987.
Misattributed