Everything Hashem does is for the good, even when it appears as curses. Yet, there are different ways of viewing this goodness. Not only is it for the good, but perhaps it is actually good in itself.
There are certain Parshios in the Torah that contain תוכחה (rebuke or curses). In order to understand why we read these, it is important to realize that every Jew is looked at by Hashem as precious and beloved. Even the curses are, in truth, blessings in disguise, meant for the ultimate good of the Jewish people.
We read the תוכחה before Rosh Hashana as a preparation for the new year, to cleanse and purify ourselves. The pain and suffering described are not punishments, but rather a process of purification and cleansing the vessel, so that we can receive greater blessings in the coming year.
Just like before a person receives something very precious, they must first wash out and destroy any impurities, so too the curses serve to prepare us for the great revelations that follow. The curses are only for a short amount of time, and are for the sake of a greater good that will be revealed afterwards.
Therefore, even when things seem difficult or painful, we must remember that everything Hashem does is for the good, and that the ultimate purpose is to bring us to a higher level of blessing and closeness to Hashem.
