"Turn from these idols"

The Apostles Barnabas and Paul tore their garments
when they heard this and rushed out into the crowd, shouting,
"Men, why are you doing this?
We are of the same nature as you, human beings.
We proclaim to you good news
that you should turn from these idols to the living God,
who made heaven and earth and sea and all that is in them.

-- Acts 14:5-18

The first commandment condemns polytheism. It requires man neither to believe in, nor to venerate, other divinities than the one true God. Scripture constantly recalls this rejection of "idols, [of] silver and gold, the work of men's hands. They have mouths, but do not speak; eyes, but do not see." These empty idols make their worshippers empty: "Those who make them are like them; so are all who trust in them." God, however, is the "living God" who gives life and intervenes in history.

-- CCC 2112

In past generations he allowed all Gentiles to go their own ways;
yet, in bestowing his goodness,
he did not leave himself without witness,
for he gave you rains from heaven and fruitful seasons,
and filled you with nourishment and gladness for your hearts."

-- Acts 14:17

God speaks to man through the visible creation. The material cosmos is so presented to man's intelligence that he can read there traces of its Creator. Light and darkness, wind and fire, water and earth, the tree and its fruit speak of God and symbolize both his greatness and his nearness.

-- CCC 1147