“Watch, listen, and learn. You can't know it all yourself—anyone who thinks that they do is destined for mediocrity.”
Trump: The Way to the Top: The Best Business Advice I Ever Received (2004), p. 20
2000s
Help us to complete the source, original and additional information
Donald J. Trump 904
45th President of the United States of America 1946Related quotes

Source: Think Big: Unleashing Your Potential for Excellence
Secrets of Being Unstoppable

“Teach to learn. Watch yourself before you teach.”
Source: The Yellow Book, 1974, p.55

"Beiwen Zhang – Adapting To Every Challenge" in Badminton Pan America http://www.badmintonpanam.org/beiwen-zhang-adapting-to-every-challenge/ (15 December 2020)
Interview to Cosmopolitan (2016)

Source: At Ease: Stories I Tell to Friends

“Learn from the mistakes of others. You can't live long enough to make them all yourself”
Cited as a piece of anonymous folk-wisdom from the 1940s onwards https://books.google.com/books?id=iNkWAQAAMAAJ&dq=%22Learn+from+the+mistakes+of+others.+You+can%27t+live+long+enough+to+make+them+all+yourself%22&focus=searchwithinvolume&q=%22make+them+all+yourself%22. Not attributed to Eleanor Roosevelt until 2001 https://books.google.com/books?id=ctxi36FCi18C&pg=PA151&dq=%22Learn+from+the+mistakes+of+others%22+%22live+long%22+roosevelt&hl=en&sa=X&ved=0ahUKEwiI_sD5mqDLAhWIKGMKHb8HAZ0Q6AEIHTAA#v=onepage&q=%22Learn%20from%20the%20mistakes%20of%20others%22%20%22live%20long%22%20roosevelt&f=false.
Disputed