Charles H. Spurgeon on Psalms 78:20

Who will say that a man is thankful to his friend for a past kindness, if he nourishes an ill opinion of him for the future? This was all that ungrateful Israel returned to God, for his miraculous broaching of the rock to quench their thirst: Behold, he smote the rock, —Can he give bread also? This, indeed, was their trade all the time they were in the wilderness. Wherefore, God gives them their character, not by what they seemed to be while his mercies were before them; then they could say, "God was their rock, and the High God their Redeemer; "but by their temper and carriage in straits; when the cloth was drawn, and the feast taken out of their sight, what opinion then had they of God? Could they satisfy his name so far as to trust him for their dinner tomorrow who had feasted them yesterday? Truly no, as soon as they feel their hunger return, like froward children, they are crying, as if God meant to starve them. Wherefore God rejects their praises, and owns not their hypocritical acknowledgments, but sets their ingratitude upon record; they forgot his works, and waited not for his counsel. O how sad is this, that after God had entertained a soul at his table with choice mercies and deliverances, these should be so ill husbanded, that not a bit of them should be left to give faith a meal, to keep the heart from fainting, when God comes not so fast to deliver as desired. He is the most thankful man that treasures up the mercies of God in his memory, and can feed his faith with what God hath done for him, so as to walk in the strength thereof in present straits. William Gurnall.