“Everybody on planet Earth is going through something you know nothing about. Be kind, less judgements, and more compassion.”
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Ralph Smart 339
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“Nothing is going on, but everybody is afraid of something.”
Source: Books, Coningsby (1844), Endymion (1880), Ch. 2.

Preface
The Ruling Passion http://www.gutenberg.org/dirs/etext97/rlpsn10.txt (1901)
“Be kind, for everyone you meet is fighting a battle you know nothing about.”
Source: The Candymakers

As quoted in the article Wangari Maathai:"You Strike The Woman ..." http://www.context.org/ICLIB/IC28/Sears.htm by Priscilla Sears; published in the quarterly In Context #28 (Spring 1991)