How about having the gift of a life saving, miraculous healing, and then needing it again? I can only compare it to what the Lord allowed to His servant Job. The Lord allowed Satan to test Jobs faith throughout the biggest losses anyone could imagine, short of letting the enemy kill him.
What has always amazed me is the strength mankind has shown throughout the ages. We are created to withstand so much on our own, yet when confronted with eternal choices, we become weakened by the world around us by far less than we expect.
By understanding the Word of God and by having relationship with the God of the Word, we can overcome the obstacles of our world and be used for His glory in it as we wait for our eternal home with our Savior.