What four? Well, it’s God, His Word, People (Souls), and Rewards. If you’re not investing in these four things what you’re investing in won’t last. Now, you might ask, “Does that mean I shouldn’t play video games?” Well, there are lots of things in life that are not necessarily bad. This can include collecting stamps, taking walks along the beach, or doing escape rooms. And things don’t necessarily fit cleanly in the eternal or not eternal category.
I mean, what if you want to build a stronger relationship with someone you’re trying to share the gospel with, and you decide to go to an escape room? I don’t see anything wrong with that. But what if you just want to spend hours and hours collecting stamps by yourself? There’s nothing necessarily wrong with that either.
This is all to say that the closer your activities look like they are an investment in eternal things the better off you are. Only God can judge this, but knowing what’s eternal and what’s not (to the best of your knowledge) might be a good starting point to decide what you invest in.