gathers moisture from the air, and begins to grow new leaves. Even when pressed and packed away in a botanist's herbarium, it has been known to grow out beyond the leaves of the book in which it is pressed. You can kill it by the heat of a hot iron, by boiling water, or by mashing it to pulp, but by no gentler means."
This little piece comes from Orison Swett Marden's book titled "The Secret of Achievement".
This comes from the chapter on the power of habit.