>>7206225I think a popular version is that part of you dies (you grow out of it), or you kill yourself. I think this is sexy but it seems like this is not what he meant.
In the Story of Philosophy by Will Durant, he summarizes this as meaning that pessimism is a luxury of self-conscious and self-important youth. It is not accepting the transition from protected,supported, comfortable youth to the individualistic, competitive, and greedy realities of adulthood. (got this from pg 262. can't attached the screen cap, it's too small for /wg)