Charles H. Spurgeon on Psalms 136:10

To him that smote Egypt in their firstborn, for his mercy, etc. Remember his sovereign grace, when righteousness would show itself upon the guilty. There was mercy even then to Israel —drops of that mercy that for ever endureth —at the very time when judgment fell on others. Should not this give emphasis to our praises? The dark background makes the figures in the foreground more prominent. —Andrew A. Bonar.