“When you get hurt, say, by an arrow, that is pain. The arrow hitting your arm, it hurts. Pain. However, there is a second arrow, which is your reaction to the arrow, the getting angry, the planning revenge, that is beyond pain, that is suffering.”
– Old Buddhist saying, based on teachings in the Sallatha Sutta.
Bite-size Dhamma 
The origin is the Sallatha Sutta, from the Samyutta Nikaya, one of the main compositions of the Buddha’s earliest teachings. See here: http://www.accesstoinsight.org/tipitaka/sn/sn36/sn36.006.than.html
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Thank you! I’ll update the post! š
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