Charles H. Spurgeon on Psalms 78:19

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.