According to Montaigne, why is he writing his essays?

Michel de Motaigne had the intentions of becoming a politician, which was the primary motive of him writing the essays. He claimed that the intention of him writing the essay is to reflect "some traits of my character and of my humours." His writings are considered to be a pivotal version of skepticism and has also taken inspiration from ancient Greek, Latin and Italian texts. However sources claim that these essays are the brain children of deep introspection conducted by him.