The Early Church Fathers gave us the Nicene Creed that provides inspired dogmatic words describing the Triune God. Among these we Catholics believe that:
Today's scientist appreciates that "mass" refers to what was previously known as "rest mass." i.e., each real particle of matter has its own particular mass that can only be measured if the relativistic effects of velocity = 0.
OT The Holy Spirit is both the Pillar of Fire [LIGHT] and the Pillar of Cloud [LIGHT].