*but as with anything in life, there is no such thing as full understanding,* - which is why the learning process will always be a continuous one . There’s certainly no stopping to learning in all ramifications . 

*This is why it is a parent's job to introduce "disappointment" into childhood experience, which isn't hard to do.* - this point right here certainly has to be a parenting hack I feel . Most parents won’t even give their wards the opportunity to make mistakes and learn from it let alone allowing them experience what disappointments feels like .