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Lit., "a truth of certainty", i.e., a truth most certain. The pronoun "this" in the above sentence relates not merely to the announcement of resurrection and life after death, but also - and primarily - to the stress on man's utter dependence on God.
"The assurance of the Hereafter" is one of the strongest features of Faith. For without it the apparent inequalities and injustices of this Life cannot be satisfactorily explained.