It began with a matrix:
The world had a mother
Whose sons can be known
As ever, by her.
But if you know them,
You'll keep close to her
As long as you live
And suffer no harm.
Stop up your senses;
Close up your doors;
Be not exhausted
As long as you live.
Open your senses;
Be busier still:
To the end of your days
There's no help for you.
You are bright, it is said,
If you see what is small;
A store of small strengths
Makes you strong.
By the use of its light,
Make your eyes again bright
From evil to lead you away.
This is called "practicing constancy."