"Aude Sapere" is a phrase which is very famous in World of Homoeopathy. But, why this phrase is so famous.? This phrase is so much famous in world of Homoeopathy because it is published on title page of philosophical rule book of Homoeopathy, "Organon of Medicine." Is it written on every edition of this book? No, it is not written on every edition of this book. Image Source - https://commons.m.wikimedia.org/wiki/File:Coat_of_arms_of_Oldham_Metropolitan_Borough_Council.png