Psalms 78:19

Psalms 78:19. Yea, they spoke against God; they said, Can God furnish a table in the wilderness?

So you see, dear friends, what speaking against God really is; I am afraid that we also have often done that. To question God’s power, is to speak against him. Perhaps you have thought lightly of your unbelieving speeches, but God does not think lightly of them; to my mind it seems that there is hardly anything that so grieves him as the doubts of his people concerning him.