What is the origin of the idiom "kindred spirit" and when to use it?

The idiom "kindred spirit" finds its origin in the concept of spiritual or emotional connection. It is derived from the belief that certain individuals possess a deep resonance or affinity with each other, despite not being related by blood or other conventional ties. The phrase is used to capture the idea that these individuals share similar values, interests, perspectives, or personalities, leading to a profound sense of understanding and camaraderie.