Grudges come naturally to kids – gratitude must be taught

Have you heard this tale? In ancient times, an escaped slave hid in a cave only to encounter a wounded lion. Although afraid, the man helps the lion, removing a thorn from its paw. The lion is forever grateful, shares his food with the man and, eventually, saves his life.

source https://www.lifetechnology.com/blogs/life-technology-news-blog/grudges-come-naturally-to-kids-gratitude-must-be-taught