Query: Who said the following statement? "Enlightenment is man's emergence from his self-incurred immaturity".
Context: Immanuel Kant (1724–1804) has formulated an individualist definition of "enlightenment" similar to the concept of bildung: "Enlightenment is man's emergence from his self-incurred immaturity." He argued that this immaturity comes not from a lack of understanding, but from a lack of courage to think independently.