You can memorize big chunks, even books, of the Bible. Unless you're part of the very small percentage of us who suffer from a traumatic brain injury or stroke or disability, you really can. And you should. But why should you? 1. Because you have a bad memory.
Don't say you can't memorize because you have a bad memory. That's why you need to memorize. I have a bad memory too. I think it's worse than average -- seriously. I forget names of people I know and see regularly! I have to force my faulty, inefficient brain to drive things that matter most into my long-term memory. This only happens by the process of repeating (memorizing) every day over a period of time. You'd be surprised what you can commit to memory if you have a simple system and put forth some effort. I've memorized five New Testament books and am working on my sixth. And that's because I have a bad memory.
2. Because you need to feed your mind.
Philippians 4:8 tells us to think about whatever is true, honorable, just, pure, lovely, commendable, excellent and worthy of praise. But how can we do this if we can't remember such things? General positive Bible concepts are not very helpful. We need specific "precious and very great promises" in our memory to draw on when we are alone and battling discouragement or anger or lust or fear (2 Peter 1:4).
3. Because the Bible is too accessible to you.
It's strange how having an abundance of something can result in our neglecting it. If the Bible's always there on our tables, tablets, phones, computers, and on the web we can dip in, read sections, search for key words when needed, but feel no urgency to really internalize it. Memorizing is one way to fight that delusion.
[Read the rest of the article at Desiring God.]