Hidden Mysteries

Suppose we have a key in our hands. We cannot directly understand the purpose of it from the key itself, nor is it possible to imagine from the key itself that a great treasure is likely to be revealed with its help. There is no hidden indication in the key regarding the treasure; the key itself is closed. Even if we break it or cut it into pieces, we may find the metal of which it is made, but we cannot learn anything about the hidden treasure which the key is capable of revealing. And whenever such a key is preserved for a long time, it only becomes a burden in our life.