pensée \pahn-SEY\, noun:
A reflection or thought.
He rose from his deep chair and at his desk entered on the first page of a new notebook a pensee: The penalty of sloth is longevity.
-- Evelyn Waugh, Unconditional Surrender
In a pensee that could have been cribbed from Mae West's daybook, she also said, “If you want to sacrifice the admiration of many men for the criticism of one, go ahead, get married!”
-- Karen Karbo, How to Hepburn
Pensée comes directly from the French word of the same spelling which means "a thought".