Related Clues:

• Branch of philosophy, hard one for unorthodox sect to grasp
• Detective's asset
• Moral code that could be his, etc
• Vulcan ideal
• Bedrock for Spock
• See smoke circling: reason?
• Losing head, ditches new rules of behaviour
• It makes sense for soldier to occupy unfinished canal construction
• Right field?
• Valid reasoning
• Focus of some committees
• Rigorous reasoning
• Vulcan's specialty
• Itches to change principles
• Puzzle solver's need