One of the struggles we all face is that even when we know the right thing to do, we don’t always do it. King David said this, in Psalm 90:12: "Teach us to number our days that we may get a heart of wisdom." (Psalm 90:12 ESV) The art of living out what King David said - The art of numbering our days so that we can live those days wisely - is largely a matter of exchanging each day for things that really matter, and not wasting our days on things that don’t matter. Carefully numbering our days so that we may get a heart of wisdom means putting first things first. But who decides what comes first?