What is the origin of the idiom "pull oneself together" and when to use it?

The origin of the idiom "pull oneself together" can be traced back to the English language, but its exact origin is unclear. The expression has been in use for quite some time and has become a common idiom in the English lexicon. It likely emerged from the concept of physically bringing different parts or elements together to form a cohesive whole. It is commonly used when someone is experiencing moments of distress, anxiety, grief, or overwhelming emotions and needs to gather themselves to face the situation with clarity and resilience.