Core competency is a strategic concept that captures an organization's capabilities, i.e., what it is particularly good at. Core ideology captures what the organization stands for and why it exists. Core values and purpose must be passionately held at a gut level or they are not core. Values and purpose are not something people buy into. They must already have a predisposition to holding them.
Core values are timeless and focus the organization internally.
Core or Business Purpose. The primary role of core purpose is to guide and inspire, not necessarily to differentiate. When properly conceived, purpose is broad, fundamental, and enduring. It captures the soul of the organization. Purpose should not be confused with specific goals or business strategies.