The center of one's thoughts or feelings; one's innermost self.

One's motives or moral character, such as whether a person means well or has bad intentions.

Wits, shrewdness, or the ability to be calculating and resourceful in handling affairs.

One's breadth of mind or capacity for patience and broad-mindedness; often used to describe someone as narrow-minded.

Unfounded misgivings or overthinking things to the point of being overly suspicious of others.