Paper can be permanent if you respect its characteristics and design accordingly.

"Every book is a conversation between the author and the reader."

所以，天地不夸耀自己的明亮，大水不夸耀自己的清澈，大火不夸耀自己的炎烈，有德之君不夸耀自己德行的高远，这样才能做众人的领袖。