Exodus 9-13: Signs and Wonders

Now the LORD had said to Moses, "I will bring one more plague on Pharaoh and on Egypt. After that, he will let you go from here, and when he does, he will drive you out completely. - Ex. 11:1 NIV
The LORD had said to Moses, "Pharaoh will refuse to listen to you—so that my wonders may be multiplied in Egypt." - Ex. 11:9 NIV

Sometimes God's signs and wonders are of a healing nature.  Other times, God's wonders can be very destructive as in the case of the plagues that came upon the Egyptians because of Pharaoh's refusal to let God's people go.  But always, God's signs and wonders have a purpose;  to bend his creation towards his will.

It is a mistake to blame miserable circumstances on others.  It may be that God is trying to do a work in their lives.  It may even be that he is trying to do a work in our life as well.  My guess is that Moses' faith grew exponentially as a result of the ever increasing plagues brought about by Pharaoh's response.