There is always a trade-off between spending time in the present and investing time in the future, just like spending money now or saving it for later. If you only spent your time in the present, then you would ignore needs of the future. You might still find food and shelter in the present but it likely would not be as good as if you spent time planning and growing to find better food and shelter in the future. On the other hand, if you spend all your time investing in the future, you’ll likely have no joy in the present. And there’s great risk, in the case of unexpected death, of losing all your investments all at once.