Live Now to Prepare for Tomorrow

As I face the future and wonder what God has for my family and I, I found this quote shared by Justin Buzzard to be extremely helpful,
What God may hereafter require of you, you must not give yourself the least trouble about. Everything He gives you to do, you must do as well as ever you can, and that is the best possible preparation for what He may want you to do next. If people would but do what they have to do, they would always find themselves ready for what came next.
-George MacDonald