St Hilary and his comments on the Trinity

In the non-biblical reading today, from the Liturgy of the hours, we are given a segment from St Hilary's treatise On The Trinity.  I thought one portion of the reading was very significant:

We receive the Spirit of truth so that we may know the things of God.  In order to grasp this consider how useless the faculties of the human body would become if they were denied their existence.  Our eyes cannot fulfill their task without light, either natural or artificial; our ears cannot react without sound vibrations...

It is the same with the human soul.  Unless it absorbs the gift of the Spirit through faith, the mind has the ability to know God but lacks the light necessary for that knowledge.