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

Naam in the real sense is beyond perception, compre­hension and apprehension. It is an unspoken language and mutely it speaks. Madam Blavatsky calls It the Voice of the Silence. A continual touch with the Word helps in stilling the mental vibrations and quieting the mind. Guru Nanak speaks of It:

Naam cannot be seen with the eyes,
nor can it be comprehended,
but with all this, it is so sweet and so loving,
O God! grant Nanak this ambrosial nectar from age to age,
so that he may ever be engaged in its lim­itless vibrations.