Mormon’s ultimate definition of the good things will be the benefits of the gospel as available through the atonement of the Savior. He had been speaking of God, however, and so he must tie the good things of God to these blessings that come through the Savior. That is the reason that he explicitly begins with God as the author of the plan, being one who knows all things from the beginning. This position of foreknowledge allowed God to provide the Savior for us. Christ is therefore the manifestation of this knowledge of God – this understanding that the atonement would be the very thing that we needed to be able to lay hold on every good thing. Those “good things” are available to use though Christ’s atonement.