Front Page Titles (by Subject) The twenty-first rule.: Chap. xxx. - The Manual of a Christian Knight
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The twenty-first rule.: Chap. xxx. - Desiderius Erasmus, The Manual of a Christian Knight 
A Book Called in Latin Enchiridion Militis Christiani and in English The Manual of the Christian Knight, replenished with the most wholesome precepts made by the famous clerk Erasmus of Rotterdam, to which is added a new and marvellous profitable Preface (London: Methuen and Co., 1905).
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The twenty-first rule.
Moreover consider how full of grief and misery, how short and transitory is this present life, how on every side death lieth in await against us, how everywhere he catcheth us suddenly and unaware. And when no man is sure, no not of one moment of life, how great peril it is to prolong and continue that kind of life in which (as it often fortuneth) if sudden death should take thee thou were but lost and undone for ever.