The more we live, the more we see and the less we think we know because we think there are more and much, much more to see and do.
That's frightening.
To fear less, to live a simple life is to live like a tiger or an enfant in a smaller world--smaller in terms of our views of things. Infants haven't seen much in life and so they feel what they know is already everything. Tigers are limited to what they see around them, and take those views as there are no other worlds or other things in life. One thinking like these two have the world for their taking, no?