1 John 5:21

"Dear children, keep yourselves from idols." 

         Idol in Greek is “eidolon”- the corresponding Hebrew word denotes “vanity”; an image or idea that worships a false god. 
Children in Greek is “teknion”- a little child, used only figuratively; a term of a affection from a teacher to his disciples under circumstances requiring a tender appeal for example Christ to the twelve before His death or the Apostle JOhn’s warning to believers against spiritual dangers. 

INTERESTING! I got a Greek dictionary for Christmas and I am loving it. It is interesting that God chose this form of child for this specific issue of idols. Though the word often means “vanity”, most of us do not think of the things we love and invest our time into as vain things at all. We love our boyfriends, or our wives, or our jobs, or we love “doing good things”- the list goes on. For this reason, the Lord calls us first “teknion”, a tender form of affection that we may listen with a soft heart. Children first, that we may feel loved and know who love is.  It all really is vanity. A danger to our spirits whenever any person, goal, or intuition is chief over our decisions and thoughts. Pure vanity, children, vanity all the way.