‘Childish’ can refer to the immature and baby-like tantrums that children sometimes have. The author is not referring to that type of ‘childish’.
He is referring to the ‘child-like’ activities of joy and wonder and fun and exploration. The unself-conscious ability to play in the rain and get muddy, the ability to wrestle with your dog or play hide and seek with your cat. He is talking about having fun in harmless ways.
Do you still have that in you?
Drawing © Marty Coleman
“As long as I continue to hear ‘normal’ people telling me I am too childish, I know I am doing just fine.” – Wayne Dyer, American author and lecturer, not dead yet.