another point is this. in order to be engraven, the same path must be taken over and over and over in order to work the material out of the substrate.
the bible is a book which speaks directly to the human condition, both spiritual and physical. i use it as a health book with great accuracy and depth of understanding. so, just as with physical health, it is what is done every day, day after day which creates the environment which determines health. spiritual or biological, it makes no difference.
the mark is doing the same things day after day, thinking the same thoughts day after day, conforming to the world instead of being transformed into a child of god.