6. Under no circumstances should the word adultery be accepted in the exclusive sense to which it is commonly applied, but rather it should be understood in more general terms. Jesus used it many times in an extensive sense to designate evil, sin and every type of bad thought, as for example in this passage: " Whosoever therefore, shall be ashamed of Me and My words in this adulterous and sinful generation, of him shall the Son of Man be ashamed, when He commeth in the glory of His Father with the holy angels" (Mark, 8: 38).
True pureness is not only in behaviour but also in thought, since the person who has a pure heart does not even think evil. Jesus wished to say that He condemned sin even in thought, because it is a sign of impurity.