The body is like a letter:
look into it and see whether it's worthy to be read by the King.
Go into a corner, open the letter, and read what is in it,
see whether its words are suitable for royalty.
If it isn't suitable, tear it to pieces,
write another letter, and remedy the fault.
But don't think it's easy to open the letter of the body;
otherwise everyone would readily discover the secret of the heart.
How difficult it is to open that letter!
It's only for the strong, not for those playing games.