“No man really knows about other human beings. The best he can do is to suppose that they are like himself.”
Source: The Winter of Our Discontent (1961), Part One, Chapter III
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John Steinbeck 366
American writer 1902–1968Related quotes

“All I care to know about a man is that he is a human being… he can't be any worse.”

19th World Vegetarian Congress 1967

Source: Means and Ends of Education (1895), Chapter 1 "Truth and Love"

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 565.