Nichiren Daishonin states in “The Daimoku of the Lotus Sutra”: About the character “myo”, the Lotus Sutra says, “This sutra opens the door of expedient teachings and reveals the true aspect of reality.”
The Great Teacher Zhang-an comments on this as follows: “Myo means to reveal the depths of the secret storehouse.”
And the Great Teacher Miao-lo says of this, “To reveal means to open.”
Hence the character myo means to open. If there is a storehouse full of treasures but no key, then it cannot be opened, and if it cannot be opened, then the treasures cannot be seen.