[HiroshiSan]

^ this. I read Paul Graham's, What You'll Wish You'd Known when I was in high school and it was like "okay great I get it" and only now after reading it again recently has it become "wow, now I feel it."

And for me it seems to boil down to feeling the message rather than knowing it. Someone can tell you to work out and stay in shape, but sometimes it takes hitting a personal low to make a permanent change.