Originally Posted by indigo
"Comparison is the thief of joy."
- Theodore Roosevelt
There are various versions of the above quote, which was originally posted to this forum thread on 10-13-2016.
Variations of the quote are attributed to several different people, which seems to indicate that it is a powerful observation, and well worth repeating. https://quoteinvestigator.com/2021/02/06/thief-of-joy/
Originally Posted by article
Comparing your status to others often produces envy and unhappiness. Here are four instances from a family of pertinent adages:

Comparison is the thief of joy.
The thief of joy is comparison.
Comparison is the death of joy.
Comparison is the death of contentment.
The article contains several more versions, along with dates ranging from 1855 - 2013.
There is even a list of references for this well-researched article.
It is a quick read, and a feast of wisdom.

Related:
This post includes a book summary which suggests:
"we should compare ourselves to ourselves and appreciate the progress we have made."