The mysterious sighing of creation, the innate aspiration of every soul toward God, that is exactly what interior prayer is. There is no need to learn it, it is innate in every one of us!

The Way of the Pilgrim

As I walk'd in Alabama my morning walk,
I have seen where the she-bird the mocking-bird sat on her nest in the briers hatching her brood.
I have seen the he-bird also,
I have paus'd to hear him near at hand inflating his throat and joyfully singing.

And while I paus'd it came to me that what he really sang for was not there only,
Nor for his mate nor himself only, nor all sent back by the echoes,
But subtle, clandestine, away beyond,
A charge transmitted and gift occult for those being born.

Walt Whitman