John Flavel

The keeping of the heart is a work that is never done till life is ended. There is no time or condition in the life of a Christian which will suffer an intermission of this work. It is in keeping watch over our hearts, as it was in keeping up Moses’ hands while Israel and Amalek were fighting. No sooner do the hands of Moses grow heavy and sink down, than Amalek prevails. Intermitting the watch over their own hearts for but a few minutes, cost David and Peter many a sad day and night.