guiding star (?.)
- North Star
- Polaris
- ambition
- aspiration
- basis
- calling
- cause
- consideration
- cynosure
- goal
- ground
- guiding light
- ideal
- inspiration
- intention
- lodestar
- mainspring
- matter
- motive
- polar star
- polestar
- principle
- reason
- sake
- score
- source
- spring
- ulterior motive
- vocation