And we know that the Son of God has come and has given us understanding, so that we may know him who is true; and we are in him who is true, in his Son Jesus Christ.   He is the true God and eternal life.   Little children, keep yourselves from idols. (1 John 5:20-21)

In order to keep ourselves from idols, we must develop the ability to identify idolatry in our hearts.   As a practical aid, consider these 13 questions from Kenny Stokes:

1. What do you most highly value?
2. What do you think about by default?
3. What is your highest goal?
4. To what or whom are you most committed?
5. Who or what do you love the most?
6. Who or what do you trust or depend upon the most?
7. Who or what do you fear the most?
8. Who or what do you hope in and hope for most?
9. Who or what do you desire the most? Or, what desire makes you most angry or makes you despair when it is not satisfied?
10. Who or what do you most delight in or hold as  your greatest joy and treasure?
11. Who or what captures your greatest zeal?
12. To whom or for what are you most thankful?
13. For whom or what great purpose do you work?

“The heavens proclaim [God's] righteousness, and all the peoples see his glory.   All worshipers of images are put to shame, who make their boast in worthless idols; worship him, all you gods!” (Psalm 97:6-7)