"How then did it work out, all this? How did one judge people, think of them? How did one add up this and that and conclude that it is liking one felt, or disliking?"

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Nothing could go wrong because nothing had...I meant "nothing would." No - Then I quit trying to phrase it, realizing that if time travel ever became widespread, English grammar was going to have to add a whole new set of tenses to describe reflexive situations - conjugations that would make the French literary tenses and the Latin historical tenses look simple.

— Robert A. Heinlein