宁缺毋滥 nìngquē-wúlàn
[would rather go without than be contented with any thing less satisfactory] 宁愿空缺,也不要降低标准,一味求多
茅盾 《子夜》五:“前天晚上,我们不是决定了宁缺毋滥的宗旨吗?”。”