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August 9 Daily Devotional

Day 221: Psalm 90:12

John Calvin

Teach us to number our days aright, that we may gain a heart of wisdom. As Moses perceived that what he had hitherto taught is not comprehended by the understandings of men until God shine upon them by his Spirit, he now sets himself to prayer. It indeed seems at first sight absurd to pray that we may know the number of our years. What? since even the strongest scarcely reach the age of eighty years, is there any difficulty in reckoning up so small a sum? Children learn numbers as soon as they begin to prattle; and we do not need a teacher in arithmetic to enable us to count the length of a hundred upon our fingers. So much the fouler and more shameful is our stupidity in never comprehending the short term of our life. Even he who is most skilful in arithmetic, and who can precisely and accurately understand and investigate millions of millions, is nevertheless unable to count eighty years in his own life. It is surely a monstrous thing that men can measure all distances without themselves, that they know how many feet the moon is distant from the centre of the earth, what space there is between the different planets; and, in short, that they can measure all the dimensions both of heaven and earth; while yet they cannot number seventy years in their own case. It is therefore evident that Moses had good reason to beseech God for ability to perform what requires a wisdom which is very rare among mankind. We then truly apply our hearts to wisdom when we comprehend the shortness of human life. What can be a greater proof of madness than to ramble about without proposing to oneself any end? True believers alone, who know the difference between this transitory state and a blessed eternity, for which they were created, know what ought to be the aim of their life. No man then can regulate his life with a settled mind, but he who, knowing the end of it, that is to say death itself, is led to consider the great purpose of man’s existence in this world, that he may aspire after the prize of the heavenly calling.


Welcome to a one-year devotional by John Calvin (1509-1564) on the Psalms. We are indebted to P & R Publishing for permission to use this copyrighted material from John Calvin: A Heart Aflame on the OPC Web site. In addition to viewing the daily devotional reading here, you may like to purchase a copy of the book A Heart Aflame from P & R Publishing or your local bookstore.

John Calvin, A Heart Aflame: Daily Readings from Calvin on the Psalms, is copyright © 1999 by P & R Publishing Company, all rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means—electronic, mechanical, photocopy, recording, or otherwise—except for brief quotations for the purpose of review or comment, without the prior permission of the publisher, P & R Publishing Company, P.O. Box 817, Phillipsburg, New Jersey 08865-0817.

Unless marked by an asterisk, italic Scripture excerpts preceding Calvin's exposition are from the HOLY BIBLE, NEW INTERNATIONAL VERSION®. NIV®. copyright© 1973, 1978, 1984 by International Bible Society, used by permission of Zondervan Publishing House, all rights reserved. Phrases of Scripture within Calvin's exposition are based on an unidentified older translation, or in rare instances modified to conform to the NIV excerpts preceding Calvin's exposition.

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