"Ask, and it will be given to you; seek, and you will find; knock, and it will be opened to you. For everyone who asks receives, and he who seeks finds, and to him who knocks it will be opened. Or what man is there among you who, if his son asks for bread, will give him a stone? Or if he asks for a fish, will he give him a serpent? If you then, being evil, know how to give good gifts to your children, how much more will your Father who is in heaven give good things to those who ask Him!
What man will give his son a stone who is hungry and asking for bread? Would he say,"I know you need your supper, but here, take this stone and chew on it for a while instead. It will really make a man out of you." Or maybe an earthly father would tell his son, "I know a fish would make a nice meal, but here's a snake in its place...let it bite you and toughen you up, instead of eating the fish. It will grow hair on your chest." No!! A good father is going to meet his son's needs.
Sometimes the church today communicates this same poor father image of God, and teaches us that God gives us lemons, instead of what we need, so we should just make lemonade. Or that God wants us sick and poor so He can teach us something. If that is what God desires, then let's all be as sick and poor as we can possibly be and REALLY please Him. Let's not go to the doctor to get help and don't try to increase our finances.
How do people give stones and serpents? When someone is struggling to believe for something, they discourage them from faith in the Lord. Some will say that if it was God's will to heal them then they would be well.