“Before sex, a man isn't thinking clearly and a woman is thinking clearly. After sex, it reverses. The man is thinking clearly and a woman isn't.”

"Radio Power Will Revolutionize the World" in Modern Mechanics and Inventions (July 1934)
Context: The scientists from Franklin to Morse were clear thinkers and did not produce erroneous theories. The scientists of today think deeply instead of clearly. One must be sane to think clearly, but one can think deeply and be quite insane.

The Storm Over the University (December 6, 1990)
Context: Finally, and perhaps most importantly, you need to acquire the skills of writing and speaking that make for candor, rigor, and clarity. You cannot think clearly if you cannot speak and write clearly.

1900s, Love Among the Artists (1900)

Panel discussion "Religion, Sex and Politics" http://www.abc.net.au/tv/qanda/txt/s2514401.htm on abc.com.au, March 19, 2009.
2009

The Business of Life (1949)

Young India (10 April 1930)
1930s
Context: To call woman the weaker sex is a libel; it is man's injustice to woman. If by strength is meant brute strength, then, indeed, is woman less brute than man. If by strength is meant moral power, then woman is immeasurably man's superior. Has she not greater intuition, is she not more self-sacrificing, has she not greater powers of endurance, has she not greater courage? Without her, man could not be. If nonviolence is the law of our being, the future is with woman. Who can make a more effective appeal to the heart than woman?

The Complete Neurotic's Notebook (1981), Women & men

Source: The Penelopiad