Do not be anxious about anything, but in everything by prayer and supplication with thanksgiving let your requests be made known to God. (Philippians 4:6)
When I am anxious about getting old, I battle unbelief with the promise, “Even to your old age, I shall be the same, and even to your graying years I shall bear you! I have done it, and I shall carry you; and I shall bear you, and I shall deliver you” (Isaiah 46:4).
When I am anxious about dying, I battle unbelief with the promise that “not one of us lives for himself and not one of us dies for himself; for if we live, we live for the Lord, or if we die, we die for the Lord; therefore whether we live or die, we are the Lord’s. For to this end Christ died and lived again that he might be Lord both of the dead and of the living” (Romans 14:7–9).
Written by John Piper
Read more at Desiring God