Possible Clues:

• Part 3 of today's quote
• Moral sense
• Rocket __
• Systematic study
• 'Nova' subject
• '. . . my words no fancy'd woes relate: / I speak from --, and the voice is Fate' (Pope, Odyssey)
• Word with rocket or earth
• Paleontology or archaeology, e.g.
• Eg, botany or physics
• It 'is nothing but perception,' wrote Plato