“Refusing to forgive never made anyone feel better about anything. All you are doing is holding on to feelings of upset, anger and jealousy and that can never be good. I once read that being angry and unforgiving towards someone else is like drinking poison and expecting the other person to die.”
Your Job-Hunt Ltd – Advice from an Award-Winning Asian Headhunter (2003), Successful Recruitment in a Week (2012) https://books.google.ae/books?idp24GkAsgjGEC&printsecfrontcover&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIGjAA#vonepage&qnigel%20cumberland&ffalse, 100 Things Successful People Do: Little Exercises for Successful Living (2016) https://books.google.ae/books?idnu0lCwAAQBAJ&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIMjAE
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Nigel Cumberland 122
British author and leadership coach 1967Related quotes

“But if I had someone I would do anything and never never never never let you feel alone.”
Wonderful World
Song lyrics, Undiscovered (James Morrison album) (2006)

“Resentment is like drinking poison and waiting for the other person to die.”
Variant: Resentment is like drinking a poison and waiting for the other person to die.
Source: Wishful Drinking

“Doing good and dedicating yourself to others will make you feel like a better person.”
Original: Fare del bene e dedicarsi agli altri ti farà sentire una persona migliore.
Source: prevale.net
“Not forgiving is like drinking rat poison, and then waiting around for the rat to die.”
Traveling Mercies
Source: Traveling Mercies: Some Thoughts on Faith

As quoted in "Tribeca Film Festival Interview: Ray Liotta Takes a Rare Comedic Turn in Snowmen" by Cynthia Ellis at Huffington Post (26 April 2010)

Don Soderquist “ The Wal-Mart Way: The Inside Story of the Success of the World's Largest Company https://books.google.com/books?id=mIxwVLXdyjQC&lpg=PR9&dq=Don%20Soderquist&pg=PR9#v=onepage&q=Don%20Soderquist&f=false, Thomas Nelson, April 2005, p. 53.
On Creating Teamwork

Unfit for Mass Consumption (blog entries), 2010
Context: I'm wondering how the new crop of teens and twentysomethings became so afraid of emotion and the expression thereof.* Did their parents teach them? Did they learn it somewhere else? Is this a spontaneous cultural phenomenon? Are they afraid of appearing weak? Is this capitalism streamlining the human psyche to be more useful by eliminating anything that might hamper productivity? Is it a sort of conformism? I don't know, but I could go the rest of my life and never again hear anyone whine about someone else being "emo," and it would be a Very Good Thing.