It is not really that Gautama declared life to be misery, as the earlier translators told us: the correct version is that he declared life to be unsatisfactory, insofar as limitations are imposed upon each separate person--limitations which bring loss, pain, disappointment. There is so much that he does wrongly through ignorance, so many things he wants but cannot have. Moreover no person finds himself in a perfect situation, a flawless environment, or a faultless set of circumstances. There is always something in each one which offsets to some extent the satisfaction it yields.
-- Notebooks Category 24: The Peace within You > Chapter 1: The Search for Happiness > # 3