万恶淫为首，百善孝为先 (萬惡淫為首，百善孝為先) wàn è yín wéi shǒu, bǎi shàn xiào wéi xiān

wàn è yín wéi shǒu, bǎi shàn xiào wéi xiān phrase sexual misconducts are the worst of all unwholesome deeds; filial piety is the foremost among all wholesome deeds
Domain: Buddhism 佛教 , Subdomain: Fo Guang Shan
Notes: (Glossary of Humanistic Buddhism)