When he went to the university at the age of seventeen, Bonhoeffer left home for the first time. The world of independent thought and action opened before him; he greedily absorbed what the philosophers and the theologians had to offer. His parents wholeheartedly supported his goals. 

Eberhard BethgeDietrich Bonhoeffer: A Biography (Revised Edition); Chapter Two: Student Years: 1923-1927, 45.