“. . . give thanks in all circumstances; for this is God’s will for you in Christ Jesus.” (1 Thessalonians 5:18, NIV)
There is a small, but helpfully significant, difference between giving thanks in all circumstances; and giving thanks for all circumstances.
There are situations and circumstances for which you and I should never be thankful: War, disease, marital discord, gross economic inequality, the persistence of evil. . . Yet, even in such circumstances, the disciple of Jesus is encouraged to be thankful — and it baffles the watching world.
In war, we know the Prince of Peace. In sickness, we are attended by the Great Physician. He is our Reconciler; and through your and my obedience, He feeds the poor. Evil may, for a time, persist; but evil shall not, ultimately, prevail!
True thanksgiving knows no season. – Luther
Daily Encouragement 
Luther, Happy Thanksgiving! And thank you for your daily gift to all of us. Cheers.