The Breath of God. The Holy Wisdom. The one who leads us to Christ. I really like the idea of the Holy Spirit as the breath of God. In the creation of humankind, God breathes the breath of life into Adam, thus giving him life.
Meditation exercises in many kinds of spirituality often start with a focus on breathing.
Without this simple, usually overlooked function, the body cannot survive. It is essential. The Holy Spirit is the breath of God in us. Breathing, to me, serves to remind that in everything I do, and everywhere I go, the Spirit is with me. This is a powerful thing, having the breath of God in us at all times, and we cannot overlook that fact.