'Keep a cold heart - Anthony Joshua advises fans

Nigerian-British boxer, Anthony Joshua, has warned his followers to be careful of being good or doing good.

According to him, while it is good to be a good person, it is also very important that one keeps a "cold heart".

In a post shared on his Snapchat, Joshua wrote that no matter the good a person does, people tend to forget it all when the person does one thing wrong.

See his post below: