When your friend is dishonest and breaks his promise, please use a famous saying to advise him.

People who have no faith do not know what they can do - Confucius

There is no constant trust in words and constant chastity in deeds. He only cares about profit and does everything. If so, he can be called a villain - - Xunzi

Belief is like the soil of the Five Elements. It has no position and no fame, but water, metal, and wood are all waiting for those who live there. ——Zhu Xi

If there is someone who is far away from heaven, loyalty is his clothes and trust is his clothes. ——Lu Zhaoling

You must treat others with sincerity, and others will reciprocate with sincerity ——Li Ka-shing

Keeping your promises is like protecting your honor. ——(France) Balzac

Once a word is spoken, it is hard to follow. ——Chinese proverb

Be honest with others, and others will not bully you; be honest with others, and everything will be accomplished.

——(middle) Feng Yuxiang

Credit is both an intangible power and an intangible wealth.

——(Japan) Konosuke Matsushita

Conscience is the sentry in each of our hearts. It is there on duty to monitor us and not do anything illegal. ——(British) Somerset Maugham

Once a word is spoken, it is hard to follow. ——Chinese proverb

If you follow an upright and honest life path, you will surely end up with a clear conscience.

——(Su) Gorky

Don’t lie, don’t be afraid of the truth. ——(Russia) Leo Tolstoy

Frankness is the product of honesty and courage. ——(US) Mark Twain

If you make a mistake, you can get back on your feet immediately; if you break a promise, you may never recover.

——(American) Franklin

It is more important for a person to strictly keep his promise than to guard his property. ——(France) Molière

Be true to yourself and you will not deceive others. ——(English) Shakespeare

Credit is rare and easy to lose. Credit that takes 10 years to accumulate is often lost due to temporary words and deeds. ——(Japan) Daisaku Ikeda

The most important thing in interpersonal relationships is sincerity, and it must come from the sincerity of the heart. Sincerity is an invincible sword in society, and you should carry it wherever you go.

——(中) Sanmao

Credit is like a mirror, as long as there are cracks, it cannot be connected as before. ——(Switzerland) Amir

Not all shiny things are gold; not all beautiful words are good words.

——(English) Shakespeare

It is better to be trustworthy than to be famous. ——(USA) Roosevelt

Honesty is better than all wisdom, and it is the basic condition of wisdom.

——(Germany) Kant

Those who have lost their trust are already dead in this world. ——(English) Herbert

(The above quotes are taken from

1. Keep your promises as if you were defending your honor. ——(France) Balzac

Once a word is spoken, it is hard to follow it - Chinese proverb

Be honest with others, and others will not bully you; be honest with others, and everything will be accomplished.