Contemplatives describe meditating on the law of God as taking a short bit of scripture and saying it over and over...allowing a word to rise above the others until you are not thinking of anything at all. You are to empty your mind of everything, and enter into silence. The scripture is just a mantra to get you to "the cloud of unknowing." Better to study the Scripture so you can better understand it. Memorize it. But don't just use it as a mantra so you can have some sort of extra-biblical revelation.