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He (Bonhoeffer) was a loner. His Tübingen friends were more interested in seeing him than he was in seeing them. It was hard for any group of people to live up the standards upheld by the home on Wangenheimstrasse. Bonhoeffer himself admitted that newcomers to his home were put under the microscope. With background, he sometimes gave the impression of being proud and standoffish. 

Eberhard BethgeDietrich Bonhoeffer: A Biography (Revised Edition); Chapter Two: Student Years: 1923-1927, 66.