Out of Egypt:

In the beginning the Word was...

...He lived in God
and possessed in Him
His infinite happiness.
That same Word was God,
who is the Beginning;
He was in the beginning
and had no beginning.
He was Himself the Beginning
and therefore had no beginning.
The Word is called Son;
He was born of the Beginning
who had always conceived Him,
giving of His substance always,
yet always possessing it.
And thus the glory of the Son
was the Father's glory,
and the Father possessed
all His glory in the Son.
As the lover in the beloved
each lived in the other,
and the Love that unites them
is one with them,
their equal, excellent as
the One and the Other:
Three Persons, and one Beloved
among all Three.
One love in them all
makes of them one Lover,
and the Lover is the Beloved
in whom each one lives.
For the being that the three possess
each of them possesses,
and each of them loves
Him who bears this being.
Each one is this being,
which alone unites them,
binding them deeply,
one beyond words.
Thus it is a boundless Love that unites them,
for the three have one love
which is their essence;
and the more love is one
the more it is love.

-St. John of the Cross