“The mediocre mind has no capacity for understanding. It is stuck somewhere near thirteen years in its mental age, or even below it. The person may be forty, fifty, seventy years old – that does not matter, that is the physical age. He has been growing old, but he has not been growing up. You should note the distinction. Growing old, every animal does. Growing up, only a few human beings manage.”

Osho, The Book of Understanding (page 177)