Psalms 78:19

Sin dispirits men, and takes away the heart. Forgetfulness of God's works is the cause of disobedience to his laws. This narrative relates a struggle between God's goodness and man's badness. The Lord hears all our murmurings and distrusts, and is much displeased. Those that will not believe the power of God's mercy, shall feel the fire of his indignation. Those cannot be said to trust in God's salvation as their happiness at last, who can not trust his providence in the way to it. To all that by faith and prayer, ask, seek, and knock, these doors of heaven shall at any time be opened; and our distrust of God is a great aggravation of our sins. He expressed his resentment of their provocation; not in denying what they sinfully lusted after, but in granting it to them. Lust is contented with nothing. Those that indulge their lust, will never be estranged from it. Those hearts are hard indeed, that will neither be melted by the mercies of the Lord, nor broken by his judgments. Those that sin still, must expect to be in trouble still. And the reason why we live with so little comfort, and to so little purpose, is, because we do not live by faith. Under these rebukes they professed repentance, but they were not sincere, for they were not constant. In Israel's history we have a picture of our own hearts and lives. God's patience, and warnings, and mercies, imbolden them to harden their hearts against his word. And the history of kingdoms is much the same. Judgments and mercies have been little attended to, until the measure of their sins has been full. And higher advantages have not kept churches from declining from the commandments of God. Even true believers recollect, that for many a year they abused the kindness of Providence. When they come to heaven, how will they admire the Lord's patience and mercy in bringing them to his kingdom!

From this verse we learn that unbelief of God is a slander against him. Yea, they spake against God. But how? The answer is, They said, Can God furnish a table in the wilderness? To question the ability of one who is manifestly Almighty, is to speak against him. These people were base enough to say that although their God had given them bread and water, yet he could not properly order or furnish a table. He could give them coarse food, but could not prepare a feast properly arranged, so they were ungrateful enough to declare. As if the manna was a mere makeshift, and the flowing rock stream a temporary expedient, they ask to have a regularly furnished table, such as they had been accustomed to in Egypt. Alas, how have we also quarrelled with our mercies, and querulously pined for some imaginary good, counting our actual enjoyments to be nothing because they did not happen to be exactly conformed to our foolish fancies. They who will not be content will speak against providence even when it daily loadeth them with benefits.