Anxiety is the poison of human life ; the parent of many sins and of more miseries. – In a world where everything is doubtful, and where we may be disappointed, and be blessed in disappointment, why this restless stir and commotion of mind? – Can it alter the cause, or unravel the mystery of human events?
Source, in full
Misattributed to Tryon Edwards by a number of websites, thinkexist.com and quoteland.com among others. This quote does appear on p. 23 of Edwards' compilation, A Dictionary of Thoughts; however, it is clearly identified there as a quote by Hugh Blair, the Scottish author and preacher.
Notes from Wikiquote
A genuine Tryon Edwards quote on the subject of anxiety appears above in the Sourced section ( from p. 22 of A Dictionary of Thoughts. )