What is the origin of the idiom "on one's conscience" and when to use it?

The phrase "on one's conscience" has its roots in the Latin word "conscientia," which means "knowledge within oneself" or "consciousness." The concept of conscience and its association with moral responsibility has been present in human societies for centuries. This idiom can be heard in conversations, debates, or discussions related to ethics, morality, and personal integrity. It is often used to emphasize the weight of guilt or remorse that someone carries due to their actions, highlighting the inner conflict and sense of responsibility they experience.