None other but God

"When during the reign of Hadrian, the uprising led by Bar Kokhba proved a disastrous error, it became essential that the Jewish people be reminded for all times of another important fact; namely, that Yisrael must never again attempt to restore its national independence by its own power; it was to entrust its future as a nation solely to Divine Providence… This fourth Blessing is an acknowledgement that it has always been God and God alone Who has given us, and still gives us to this very day, that good in which we have had cause to rejoice and that for future good too, we may look to none other but God, and none beside Him." Rav Samson Raphael Hirsch on Birchos HaMazon