Why Am I So Miserable?

"Luther counsels every Christian to answer all temptations with this short saying, 'Christianus sum,' I am a Christian; and I would counsel every Christian to answer all temptations with this short saying,'The Lord is my portion.' O Christian, when Satan or the world shall tempt thee with honors, answer, 'The Lord is my portion'; when they shall tempt thee with riches, answer, 'The Lord is my portion'; when they shall tempt thee with preferments, answer, 'The Lord is my portion'...yea, and when this persecuting world shall threaten thee with the loss of thy estate...with the loss of thy liberty...with the loss of friends...and...with the loss of life, answer, 'The Lord is my portion...' " (The Treasury Of David)