三千弱水只取一瓢
[sān qiān ruò shuĭ zhĭ qŭ yī piáo]
An idiom taken from Chinese classical texts, 'Sipping But One Ladle from The Vast Expanse of Waters' represents a person who, though surrounded by choices or temptations, remains loyal or steadfast in their commitment to just one person or thing, emphasizing focus and devotion.