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I guess the only thing to add that comes to mind recently is hearing the Psalms. David in so many of the Psalms speaks about "God awarding him according to his deeds". And what is striking about that is the whole "works righteousness" thing that we hear so much about (Because we can't earn our salvation aka "Pelagianism" the notion of works is often kind of pooh poohed)

But in the context of the Bible it is very important, because their is a kind of anchor for your Faith and Hope. Essentially David was saying in the Psalms that most of the time, he was emphatically observing the OT Covenant and doing so fervently for God in thought, word and deed he knew God was so much more faithfully than he is, therefore he can have confidence in his future.