Ultimately our lives are in God's hand; even the next breath you take is a gift from Him. If He were to withdraw His hand from you, your life would end- despite the most strenuous efforts of your doctors.
What difference should this make? First, it should remind us of our dependence upon God. All too often we assume that our lives and our future are in our hands, But they aren't; they are in His hands.
But this should also remind us that each day is a gift from God- a gift to be used wisely, joyfully, and for His glory.
" No man has power over the wind to contain it; so no one has power over the day of his death."- Ecclesiastes 8:8