(English) In his book W. M. Watt, meanwhile Emeritus Professor of Arabic and Islamic Studies, describes the background of some myths and misconceptions defining the Muslim-Christian relationship partly until the present time. According to nowadays’ understanding of scientific approaches it is unpopular to write about a “testimony” and some “fruits of faith”. W. M. Watt as an authority in this realm does so in his book. His central message is that Muslims and Christians should aim at a fruitful and lively dialoge in mutual respect towards each other’s religion and values by getting to know each other better.