The story 'The Last lesson' highlights which human tendency?

I heard M. Hamel say to me, 'I won't scold you, little Franz; you must feel bad enough. See how it is! Every day we have said to ourselves, Bah! I have plenty of time. I'll learn it tomorrow. And now you see where we have come out. That's the great trouble with Alsace; she puts off learning till tomorrow.