Benjamin Franklin on quality

The bitterness of poor quality lasts long after the sweetness of low price is forgotten.

~ Benjamin Franklin

(as quoted by Björn Fahlén in Quality First Investing: A checklist approach to finding and sitting tight in multibaggers)

Nassim Taleb on maintaining quality

When you write books, when you do anything, you should never let the person have doubts about the quality of the product.  So if you're not sure about something, you say "I'm not sure, it's not my specialty."  Don't voice an opinion; you devalue yourself.  Or don't produce anything that devalues your product.

~ Nassim Taleb, "Nassim Nicholas Taleb on Skin in the Game," interview with Katrine Marçal, 10:45 mark, October 1, 2019