A threat to the ego
There is no age to learn from. A teenager can teach a 60 year old, and that is 💯 ok. It's the humbleness required to allow oneself to step aside from all they know (and put aside the egos phrase "I know that already"), and welcome wisdom/input from anywhere it comes to them.
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Allot of millennials keep surprising me with the level of wisdom they already have at age 19/20 or so.
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Regardless of ones financial success, business knowledge, spiritual and nutritional knowledge, there is always someone out there who knows something they don't and can contribute to them... Being open, allowing, giving a chance to others... don't do it only if you want to learn something you didn't know you didn't know... because u can, can u not? now.