惠而不费 beneficial and effortless
Explanation
惠：给人好处；费：耗费。给人好处，自己却无所损失。指做好事不费力，不花钱。
Huì (惠): to benefit someone; Fèi (费): to spend. To benefit someone without any loss to oneself. It means to do good deeds without effort and money.
Origin Story
从前，有个村庄经常遭受洪水的侵袭，村民们苦不堪言。一位名叫李善的年轻秀才，他观察到村庄上游的山上有许多疏松的泥土，一旦下雨，这些泥土就会被冲刷下来，堵塞河道，导致洪水泛滥。于是，他组织村民们，在山上植树造林，巩固山体，疏通河道。这项工程花费了大量的人力物力，但是李善始终坚持，没有向村民们收取任何费用，也没有索取任何报酬。几年后，村庄再也没有遭受洪水的侵袭，村民们的生活安定祥和。李善的善举，惠而不费，受到了村民们的敬仰和赞扬。
Once upon a time, there was a village that was frequently attacked by floods, and the villagers suffered greatly. A young scholar named Li Shan observed that there was a lot of loose soil on the mountain upstream of the village. Once it rained, this soil would be washed down, blocking the river channel and causing floods. So he organized the villagers to plant trees on the mountain, consolidate the mountain body, and dredge the river channel. This project cost a lot of manpower and material resources, but Li Shan insisted on it and did not charge the villagers any fees or ask for any reward. After several years, the village was no longer hit by floods, and the villagers lived a stable and peaceful life. Li Shan's good deed, beneficial and effortless, was admired and praised by the villagers.
Usage
形容做好事不费力，不花钱。
Describes a good deed that is accomplished without effort or expense.
Examples
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这次活动做得很成功，既达到了宣传目的，又没有增加额外支出，可谓惠而不费。
zhè cì huó dòng zuò de hěn chéng gōng, jì dào dá le xuān chuán mù dì, yòu méi yǒu zēng jiā é wài zhī chū, kě wèi huì ér bù fèi.
This event was very successful. It achieved the publicity goals without increasing additional expenditure, which can be described as beneficial and effortless.
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他乐于助人，经常帮助别人解决问题，而且自己毫不费力，真是惠而不费。
tā lè yú zhù rén, jīng cháng bāng zhù bié rén jiě jué wèntí, ér qiě zì jǐ háo bù fèi lì, zhēn shì huì ér bù fèi.
He is willing to help others and often helps others solve problems without any effort of his own. It's really beneficial and effortless.