A student's question

My teacher keeps drilling into our collective heads that using the break command is harmful, and that if we wish to terminate a loop early it would be far better to create a boolean variable, set it to 0, and add a condition to the head of the loop, and set the boolean variable to 1 when a break is needed. Note that this way you actually have to check this every single loop (where it is not needed almost every time) as well as waste a command to reset the boolean in case it was set to true.

Is there a reason to this?

>>17
Young man, you have learned a little bit and think you knows it all, but soon you will grow out of your sophomoric sophistication and come to realize that the world is more complicated, and you will begin again to understand that LISP is The Right Thing.