Sforno on Deuteronomy 11:26/ספורנו על דברים י״א:כ״ו

1ראה, pay good attention so that you will not be like the nations of the world who are always trying to find middle ground. Remember that אנכי נותן לפניכם היום ברכה וקללה, I present you this day with the choice of two extremes, opposites. The ברכה is an extreme in that it provides you with more than you need, whereas the קללה is another extreme making sure that you have less than your basic needs. You have the choice of both before you; all you have to do is make a choice.