“The most exhausting thing in life, I have discovered, is being insincere.”
Source: Gift from the Sea (1955), Ch. 2; part of this statement has often been paraphrased: "The most exhausting thing in life is being insincere."
Context: I find I am shedding hypocrisy in human relationships. What a rest that will be! The most exhausting thing in life, I have discovered, is being insincere. That is why so much of social life is exhausting; one is wearing a mask. I have shed my mask.
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Anne Morrow Lindbergh 72
American aviator and author 1906–2001Related quotes

Foreword for Discovering the Brain (1992) by Sandra Ackerman, p. iii; often paraphrased: "The brain is the most complex thing we have yet discovered in our universe."
Context: The brain is the last and grandest biological frontier, the most complex thing we have yet discovered in our universe. It contains hundreds of billions of cells interlinked through trillions of connections. The brain boggles the mind.

1910s, Address at Milwaukee, Wisconsin (1912)

This Business of Living (1935-1950)
Leslie Berger (January 28, 1982) "A Little Night Humor", The Washington Post, C1.

Deeds Rather Than Words (1963)
Context: I don't believe in playing down to children, either in life or in motion pictures. I didn't treat my own youngsters like fragile flowers, and I think no parent should.
Children are people, and they should have to reach to learn about things, to understand things, just as adults have to reach if they want to grow in mental stature. Life is composed of lights and shadows, and we would be untruthful, insincere, and saccharine if we tried to pretend there were no shadows. Most things are good, and they are the strongest things; but there are evil things too, and you are not doing a child a favor by trying to shield him from reality. The important thing is to teach a child that good can always triumph over evil, and that is what our pictures attempt to do.