It's hard to meditate on scripture if one does not memorize scripture.
Memorizing even great chunks of scripture is kinda like wall paper...doesn't mean anything unless it's applied.
How do you know how to apply it?
You think...you meditate...you chew.
And if it is hidden in your heart (memory), you can meditate on it whenever, and as you become aware of its truth apply it.
Give this John Piper sermon jam a watch/listen: