Reticence.

A poem by Emily Dickinson

The reticent volcano keeps
His never slumbering plan;
Confided are his projects pink
To no precarious man.

If nature will not tell the tale
Jehovah told to her,
Can human nature not survive
Without a listener?

Admonished by her buckled lips
Let every babbler be.
The only secret people keep
Is Immortality.