We live in a day when we don't even memorize each others' phone numbers, because we don't have to. Memorization doesn't feel like a necessary skill, and it certainly doesn't feel like a vital spiritual discipline. But that is wrong. Scripture that is memorized is Scripture that can be meditated upon. And while it is difficult to remember even half of what you read, you remember 100% of what you memorize - by definition - as long as you consistently review what has been memorized.