From the Baltimore Catechism and Mass Number 3 Confraternity ed by Connell, page 13
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16. What do we mean when we say God is all-present?**
When we say that God is all-present we mean that He is everywhere.
a) God is everywhere:
first, by His power, inasmuch all things are under His dominion;
second, by His Presence, inasmuch nothing is hidden from Him;
third, by His essence, inasmuch as He is in all things as the cause of their being.
Scripture:
“Whither may I go from thy spirit, or whither may I flee from thy face? If I ascend into heaven, thou art there; if I lie down with the dead, thou art present. If I lay hold of the wings of the dawn, if I dwell in the farthest part of the sea: Even there shall thy hand lead me, and thy right hand shall hold me.” Psalm 138: 7-10
To break it down further, Jesus Christ is Present as the Risen-Christ, the God-Man in the consecrated Eucharistic Host, and is Present everywhere else within the Trinity. He is present as the God-Man in His Resurrected Body at the right-hand of the Father and in the Consecrated Host.
However, this needs qualifications. God did not break off pieces of Himself and place them in Creation. (That’s pantheism). God is not present in my highlighter pen, otherwise, I should worship the pen, right? So, God is present everywhere in His Omnipresence (all-seeingness), but He didn’t cleave off pieces of Himself and thrust them into Creation. He is Present as the cause of life, for without God, life would cease to exist. But, God can exist without Creation, for He is happy in and of Himself. One could then say that God’s Will is necessary for the existence of Creation, his consent.
Creation is like a big painting, and God is the Artist. We see evidence of God’s presence in His creation because an artist’s work is always a reflection of some part of his soul. We see evidence of God’s Essence because of the shere existence of the painting.
Hope that helps, albeit clumsily written—I’ve been away from this for a few weeks and am a bit rusty. Glad to see CAF up and running again.
God Bless!