Commentary on Mishlei 23:30, as cited in "Separation from the Worldly (Perishut)" http://etzion.org.il/en/separation-worldly-perishut
Vilna Gaon: Frases em inglês
Alim li-Terufa as cited in "Separation from the Worldly (Perishut)" http://etzion.org.il/en/separation-worldly-perishut