“The best teacher in life is experience.”

Source: The Noticer: Sometimes, All a Person Needs Is a Little Perspective

Misattributed
Source: Often attributed to Kerouac's On the Road, the quote cannot be found in that book, nor in any of Kerouac's other published works.

http://zenhabits.net/read/ How to Read More: A Lover’s Guide (3 October 2011)
Zen Habits (2007–present)

Source: Dictionary of Burning Words of Brilliant Writers (1895), p. 572.

Source: The Picture of Dorian Gray

As quoted in Chopin : Pianist and Teacher as Seen by His Pupils.
Source: Chopin : Pianist and Teacher as Seen by His Pupils (1986) by Jean-Jacques Eigeldinger, Roy Howat, Naomi Shohet, and Krysia Osostowicz, p. 23

Source: HR from the Outside In, 2012, p. 105

Source: Hold On to Your Kids: Why Parents Need to Matter More Than Peers

Quoted in: Kabir, Hajara Muhammad (2010). Northern women development. [Nigeria]. ISBN 978-978-906-469-4. OCLC 890820657.
1980s