God does not save us because we are good. God saves us despite that fact that we are not good and because he loves us. Jesus tells us that he has overcome the world and he has done it for us and he has done it precisely because we cannot overcome the temptations of the world ourselves. The spirit is the spirit not of bondage to fear but the spirit of adoption whereby we cry abba father. The spirit as adopted us and made us God's children.
Nothing can take that away except our refusal to repent.
St. John xiv. In those days they were, in a sense, back to the same situation that had existed before the first Christmas. God was in heaven, Jesus was up there with him, but no person of the Holy Trinity was specifically on earth. The collect acknowledges the great and powerful and victorious wonder of the Ascension, saying that God has exalted Jesus with great triumph into his kingdom in the skies. But now that he has taken Jesus away to his right hand, we ask him not to leave us here without any comfort.