Ba'al Shem Tov, Kuntres Meirat Einayim 44/בעל שם טוב על התורה·קונטרס מאירת עינים מ״ד

1The Holy Rabbi of Kobrin said, “We must believe all the stories, miracles and wonders attributed to the Baal Shem Tov. We should believe that even if they didn’t happen, they could have happened.”Imros Tahoros, p. 34