The phrase "great disillusionment" refers to a feeling of disappointment or loss of belief when something or someone you admired or trusted turns out to be different from what you expected. Full definition
German theologian Dietrich Bonhoeffer acknowledged this reality in Life Together: Just as surely as God desires to lead us to a knowledge of genuine Christian fellowship, so surely must we be overwhelmed by a great disillusionment with others, with Christians in general, and, if we are fortunate, with ourselves. (relevantmagazine.com)
Just as God desires to lead us to a knowledge or genuine Christian fellowship, so surely must we be overwhelmed by a great disillusionment with others, with Christians in general, and if we are fortunate, with ourselves. (nakedpastor.com)
Just as surely as God desires to lead us to a knowledge of genuine Christian fellowship, so surely must we be overwhelmed by a great disillusionment with others, with Christians in general, and, if we are fortunate, with ourselves.» (nakedpastor.com)