The true purpose of the blessings

Parshas Re'eh sets a blessing and a curse side by side, yet the two are not worded the same. The curse comes "if you do not listen." The blessing carries no "if" at all. The Torah is usually exact, so why the difference, and what does Rashi's short comment say about it? Rav Ganzfried's Apiryon gives a picture from a parent's love. A man filling out a mortgage insurance form discovers something he had never noticed about his own life, and about how quickly we count what is going wrong.