From the book "Naam or Word", written by Sant Kirpal Singh

 

Word or Naam is the Sound Current or Sound Prin­ciple. This current or principle lay merged in the Great Silence and was hence nameless. There was then nothing but Deep Silence with no name or pattern, no design or form and no color or shade. The life vibration (principle) hidden therein, stirred the Great Deep and there came a Great Sound called Word and the whole creation came into being, and is being sustained by this. With the with­drawal of the Naam or Sound there sets in disintegration and decay in all that lives, with consequent putrefaction, and the result is dissolution which in common parlance is known as death. Thus this Sound is at once the beginning and the end of all that exists:

He – the Nameless – expressed Himself and made the Naam or Word.
GURU NANAK

It is called variously as Sound, Sruti (that which is heard), Shabd or Akash Bani (voice from the heaven), Udgit, Sraosha (music of the beyond), Word or Harmony, Logos or the Holy Spirit, Kalma or Bang-i-Ilahi (call from God) or Nida-i-Asmani (heavenly sound).

Thou manifested Thyself as Naam and set up the creation.
Out of the Formless proceeded forms in varying degrees.

GURU NANAK

This entire extensionalism is just of the Naam and there is nothing which is not of Him:

Thou art immanent in all;
And nothing is where Thy Word is not.

GURU NANAK

Again,

All that is of life and all that is of matter is from the Naam (whether visible or invisible);
Without a Master-soul one cannot have contact with the Naam.

GURU AMAR DAS

It may here be necessary to describe in brief the four Grand Divisions of the Universe. These Grand Divisions are:

(i) Sach Khand or the region of Sat Naam: This region is of pure spirit unalloyed by matter,

(ii) Par Brahm: Here spirit and subtle form of matter combine in varying degrees, yet spirit is the ruling force,

(iii) Brahmand: Where spirit and matter in its gross form combine. Here the spirit, for its manifestation, has to depend on matter. It consists of Trikuti and Sahasrar (Und).

(iv) Pind or the physical plane: Where the spirit lies dor­mant under a heap of matter in its grossest form.

Naam or Word is both the Creator and the Sustainer of the Universe:

The Naam or Word is the Power of God that has created the Universe,
The same Power is sustaining all by its immanence in every form.

GURU RAM DAS

Everything comes into being and lives by the Naam or Power of God,
Forgetting the Naam, we breathe hollow.

GURU AMAR DAS

Upholding all things by the Word of His Power.
And He is before all things, and by Him all things consist.

ST. PAUL

By the Word of the Lord were the heavens made,
And all the host of them ... for He spake, and it was done;

He commanded, and it stood fast.
THE PSALMS

Through faith we understand that the worlds were framed by the Word of God . . .
ST. PAUL

By the Word of God the heavens were of old,
and the earth standing out of the water
. . .
But the heavens and the earth which are now,
by the same Word are kept in store . . .

ST. PETER

Word is at once the Creator and the Sustainer of the Universe.
Word transcends all forms and all names,
They who worship the Word, alone live.

Word sustains the entire creation,
He is the Kernel in every shell.

GURU ARJAN

John Dry den, in his song for St. Cecilia's Day (1687), refers to it as Harmony:

From Harmony, from heavenly Harmony,
This Universal frame began;

When Nature underneath a heap

Of jarring atoms lay,
And could not heave her head

The tuneful voice was heard from high

Arise, Ye more than dead!

From Harmony, from heavenly Harmony

This Universal frame began:

From Harmony to Harmony

Through all the compass of the notes it ran,

The diapason closing full in Man.

Word or Naam is the great Progenitor or the Primeval Cause of the entire creation with the various divisions high and low. We have the testimony of Guru Arjan in this behalf:

Naam is the life-principle in all that lives,
Naam is the foundation-stone of the Cosmos with its divisions.
Naam is the Creator of Heavens and nether lands, Naam is the Manifester of all forms.
Naam is the sub-strata of all regions, Naam is the liberator from all bondage.

The various Khandas or planes exist because of Naam and different Yugas or classifications of time owe their origin to Naam:

There is but one source of the different divisions of time and Universe.
This has been revealed to me by the Master-soul.
Naam is a great storehouse of all that one may wish for.
Why then should I move out for this or that?

GURU ARJAN