According to Paul, God is jealous of His own creation:
For what can be known about God is plain to them, because God has shown it to them. For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse. For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. Claiming to be wise, they became fools, and exchanged the glory of the immortal God for images resembling mortal man and birds and animals and creeping things.
Therefore God gave them up in the lusts of their hearts to impurity, to the dishonoring of their bodies among themselves, because they exchanged the truth about God for a lie and worshiped and served the creature rather than the Creator, who is blessed forever! Amen.—Romans 1:19-25 (ESV)
"Images" references the idolatry found in the Ancient Near East and condemned in Exodus 20 and elsewhere in the Old Testament. Jesus expanded the definition of idolatry to include anything that demands the place of God, which isn't God:
No one can serve two masters, for either he will hate the one and love the other, or he will be devoted to the one and despise the other.—Matthew 6:24a (ESV)
The immediate reference, of course, is money, but other worldly things can take God's place as our master:
And others are the ones sown among thorns. They are those who hear the word, but the cares of the world and the deceitfulness of riches and the desires for other things enter in and choke the word, and it proves unfruitful.—Mark 4:18-19 (ESV)
God is so amazing that He is able to create things that seem worthy of worship. But those things are not worth our time, energy and devotion compared to the surpassing glory of God Himself. God wants us to spend our lives on the one thing that is more valuable than ourselves: Him.
To illustrate what this might mean, consider the career of Blaise Pascal, mathematician, physicist, inventor, writer, philosopher, and all-around genius. Around the time of his conversion, Pascal wrote a poem called "Fire" that begins:
GOD of Abraham, GOD of Isaac, GOD of Jacob
not of the philosophers and of the learned.
Certitude. Certitude. Feeling. Joy. Peace.
GOD of Jesus Christ.
Deum meum et Deum vestrum.
Your GOD will be my God.
Forgetfulness of the world and of everything, except GOD.
He gave up everything (mostly and most of the time) to focus his thoughts on God—a task that remained unfinished at death. While he was, perhaps, too extreme in his asceticism, I do not believe that he now regrets leaving the world behind him. Personally, I consider Pascal one of my heroes of the faith.