Chasidut zu Schemuel I 2:2

And I have already explained the verse, “There is none holy like the Lord, since there is none besides Him” (I Samuel 2:2) – see there. And there it is explained that every physical thing of this world has the four letter name of God sustaining it from nothingness to being, such that it not be nullified in existence – and that is through the holy letters of the four letter name of God and their substitutes. For example, the word, even (stone), has three letters which come out of the four letter name, by way of many substitutions and combinations. Hence it is very physical – as is written in the Tanya (Tanya, Part Two, The Gateway of Unity and Belief 1) about the verse, “Great, etc. and full of power” (Psalms 147:5) – see there. And there is hence also internality and externality in all things – meaning the internality is the letters that make and sustain them from nothingness to being; whereas the externality is that which is seen by the eyes. And that is an illustration of the “holy and blessed” that was referred to.