Treasury of Guidance for the Muslim Striving to Learn His Religion: Book 8

From the book’s back cover :Yo adorn oneself with beautiful etiquette, noble manners, good behaviour, and pious conduct are distinguishing characteristics of the people of Islaam, and knowledge the most precious pearl in the crown of the purified sharee ah~cannot be attained except by those who adorn themselves with its etiquette and those who leave evil qualities associated to it.