“It should be pointed out that certain correlative concepts retain their meaning, and possibly their foremost significance, if they are referred exclusively to man. One might, for example, speak of an unforgettable life or moment even if all men had forgotten it. If the nature of such a life or moment required that it be unforgotten, that predicate would not imply a falsehood but merely a claim not fulfilled by men, and probably also refer to a realm in which it is fulfilled: God’s remembrance.”