“I can alter my life by altering my attitude. He who would have nothing to do with thorns must never attempt to gather flowers.”
Help us to complete the source, original and additional information
Henry David Thoreau 385
1817-1862 American poet, essayist, naturalist, and abolitio… 1817–1862Related quotes

“All human beings can alter their lives by altering their attitudes.”
Stanley
Alessandra
1995-12-07
Dmitri Volkogonov, 67, Historian Who Debunked Heroes, Dies
New York Times
https://web.archive.org/web/20110120220404/http://www.nytimes.com/1995/12/07/world/dmitri-volkogonov-67-historian-who-debunked-heroes-dies.html
.

“When my information changes, I alter my conclusions. What do you do, sir?”
Reply to a criticism during the Great Depression of having changed his position on monetary policy, as quoted in "The Keynes Centenary" by Paul Samuelson, in The Economist Vol. 287 (June 1983), p. 19; later in The Collected Scientific Papers of Paul Samuelson, Volume 5 (1986), p. 275; also in Understanding Political Development: an Analytic Study (1987) by Myron Weiner, Samuel P. Huntington and Gabriel Abraham Almond, p. xxiv; this has also been paraphrased as "When the facts change, I change my mind. What do you do, sir?"
Attributed

“It is education that has altered my life. Carried me far.”
Hunger of Memory: The Education of Richard Rodriguez (1982)

“If he were
To be made honest by an act of parliament
I should not alter in my faith of him.”
Act IV, scene 1
The Devil Is an Ass (performed 1616; published 1631)