The meditation of my heart

My preschooler has started mumbling things under her breath.  Mostly, when she feels like she's being bossed around by us and her big sister.  I know I shouldn't laugh, but I can't help it!  Her latest was, "I don't want to, and that's dumb!" when I asked her to clean her room.  Mostly it's her way of talking back to me because she thinks I can't hear her!  But we're all that way, aren't we?  Even us grownups! 

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Let the words of my mouth and the meditation of my heart be acceptable in Your sight, O Lord, my strength and my Redeemer! (Psalm 19:14)

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Help me, Lord, to guard not only the words I speak, but also the thoughts I have.  Help me bring my thoughts captive if they are not of You, because if I don't, those thoughts will all too quickly become the next words flowing out of my mouth!