What is the origin of the idiom "be all things to all people" and when to use it?

The idiom "be all things to all people" has a biblical origin, found in the New Testament, Corinthians 9:22: "I have become all things to all people, that by all means I might save some." In this context, it means being adaptable and accommodating to different individuals and groups to achieve a common goal. In contemporary usage, it is often used to describe someone who tries to please everyone or fit into various social or professional situations, even if it means being inconsistent or insincere.