It's very difficult to distinguish between what a person believes and what they say they believe.
Daniel KahnemanRailroads are the primary economic beneficiaries. It's a difficult project for the public sector.
John GatesAnything based on ancient texts is difficult for a modern reader to get their head around.
Joanne HarrisSaavik: Humor. It is a difficult concept. It is not logical. Kirk: We learn by doing.
Star Trek II: The Wrath of Khan