Related Clues:

• Sanity and logic
• Common sense, rhymes with house
• Logic and rationality
• Feels stinging pain
• Common sense
• Cause for sanity
• It controls the central nervous system
• Ability to think rationally
• 'Motivation, grounds (6)'
• Motive for an action
• Not left around, by the sound of it, so that's OK.
• Why, that's about a child!
• Is this why one might think about a start for 33 across?
• Commonsense will tell you that we are not all there
• This, being over everything else, may also be 2 down