I believe he's talking about some prevention is better than cure sort of thing. It's not important to get your car checked today because you have important things to do. However, if this happens every day, then one day your car is going to fail. Then, getting the car checked becomes a priority but if you'd fit it in earlier on, you could have gotten away with never having to deal with an emergency.

Essentially, he's talking about how we discount future risk when we prioritise tasks.