“A friend may be waiting behind a stranger's face.”
Source: Letter to My Daughter
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Maya Angelou 247
American author and poet 1928–2014Related quotes

“May I never sit on a tribunal where my friends shall not find more favor from me than strangers.”
As quoted by Plutarch, in Lives as translated by J. Langhorne and W. Langhorne (1850) http://books.google.com/books?id=jaBfAAAAMAAJ, p. 225

And that's when I got the idea of touring.
Here and Now

“Friends, we're hardly strangers at meeting danger.”
XII. 209 (tr. Robert Fagles).
Odyssey (c. 725 BC)

“There are no strangers in here, just friends you haven't met…”

“Fear makes strangers of people who would be friends.”
Don't Fall Off the Mountain http://books.google.com/books?id=f6yc35pUhEwC&q=%22The+more+I+traveled+the+more+I+realized+that+fear+makes+strangers+of+people+who+should+be+friends%22&pg=PA160#v=onepage (1970)
Variant: The more I traveled the more I realized that fear makes strangers of people who should be friends.

“There are no strangers, only friends you have not met yet.”
“The stranger is simply a friend I haven't met yet.”
Source: Poustinia (1975), Ch. 15

Widely attributed, but likely apocryphal. https://quoteinvestigator.com/2015/08/23/friend/ Researchers have searched for this quote unsuccessfully in Camus' extant works.
Disputed