Not that I agree with this but I'm pretty sure the point is that the work can be the same over a lifetime.
For example working out will get you a fit body and will give you better health in the long run and will get easier with time.

Eating shit food is easy now but you will get overweight and it will get harder the longer and unhealthier that you get.

So basically it's a work hard and keep up with life and have more doors open to you or slack off and get left behind by life and have more doors closing which will make you struggle more.

There is truth in that but reality also isn't so black and white and it's worded poorly.