The Hairs of the Head are a revelation of the holiness of the Brain just as it is within. However, the Beard is such that its lights descend in sequence, level by level, to Zeir Anpin.
Having discussed how Arich Anpin is the root of Zeir Anpin, let us examine the start of this root’s descent.
The proposition consists of two parts. Part 1: The Hairs of the Head… This explains the nature of the Hairs of the Head. Part 2: However, the Beard… This explains the nature of the Hairs of the Beard.
Part 1: The Hairs of the Head are a revelation… As the proposition itself states afterwards in Part 2, the Hairs of the Beard are channels that draw the light of Chochmah S’tima’ah – the Concealed Wisdom – to the outside so as to produce the downward chain of development. Yet the Hairs of the Head also draw forth light from the Brain, as stated in the Idra Rabba (129a): “In every strand there is a flow that comes forth from the Concealed Brain”. Accordingly we must first understand the difference between the Hairs of the Beard and those of the Head. The difference is that the Hairs of the Head merely reveal the light of the Brain exactly as it is and not by way of sequential development and gradation. However, the Beard draws the light downwards sequentially, level by level.