This d'var Torah is based on the writings of Rav Kook.

Last week, we read in parasha Shemot, that when Moshe and Aharon
approached Pharoah to let the Israelites go into the wilderness to
bring offerings to HaShem, they received the following response from
Pharoah: "Who is HaShem that I should heed His voice to send out
Israel? I do not know HaShem, nor will I send out Israel!"

Rav Kook's interpretation of this response was that Pharoah was
actually saying, "G-d does not exist, there is no such thing as the
G-d of Israel, and He has no power over me." Pharoah was raising three
objections to the demands of Moshe and Aharon. The response sent by G-d in the
form of the plagues, was meant to counteract each of Pharoah's
objections.

The Egyptians had many gods. A midrash states that Pharoah asked his
servants to bring him a compendium of all of the gods and he could
not find the name of the G-d of Israel mentioned in the collection.
Because the G-d of Israel could not be seen, the idol worshippers of
Egypt could not accept his existence. Therefore the first plague was
designed to counteract not only Pharoah's belief that there was no G-d
of Israel but the belief of his subjects as well. As you know the
Nile was worshipped as a deity by the Egyptians because it sustained
them. By turning the water into blood, G-d was showing that their
faith in their gods could be shaken. But, as we learn in chapter
7:19, Hashem also turned the canals, reservoirs, and all the
gatherings of water including those in wooden and stone vessels, to
blood. The larger message according to Rashi, was that G-d was
connected to the physical world, even though Pharoah originally felt
G-d did not exist.

As you know, the second plague was that of the frogs that emerged from
the waters and infested the land. The Torah tells us that they
"entered the palace, Pharoah's bedroom and bed, the houses of his
servants and the people, their ovens and their kneading bowls."
This description according to Rav Kook, is designed to show that
Judaism's "spirituality covers every single area of life. There are
laws governing one's conduct at home, in the bedroom, and even in the
most intimate situations, in bed. Unlike idol worship that relegated
G-d to the Temple and assigned Him a few religious rites, true
Divinity is concerned with man's entire existence." In Egypt, it was
Pharoah who controlled the policies of the nation. In Judaism, all
were subject to the laws of G-d, including the king. The plague of the
frogs was designed to show that even a King must not forget that he is
not G-d, but is to serve as a messenger of G-d.

The third plague in this group of plagues,
was lice. If you've ever had an opportunity to view a
louse, it often takes a microscope to see all of its parts. Lice are
miniscule. This plague informed the magicians of Egypt, that even
though they could successfully repeat the tricks of blood and frogs,
it was G-d alone, without magic, who had influence over creating the
smallest of creatures. In chapter 8:15 the sorcerers actually admit G-d's power by saying to Pharoah,"It is a finger of God!"

The first three plagues accomplished the goal of letting Pharoah and
the Egyptians know that G-d does indeed exist and has a hand in this
world.

So is there a lesson in this for us today other than just reading a
story about characters from our past? I think so. One message of the
Torah is that life is not an accident. G-d gives us life. G-d exists,
and although we may struggle to understand G-d, lack of understanding
on our part does not negate G-d's existence. We may never receive the
kinds of grandiose signs that Pharoah and his magicians received, but
it should not take that for us to accept G-d's presence in the world.
We need to learn to see that the complexities of life and living
things are due to G-d's hand in the world. We humans are not G-d, nor are
our leaders G-d, but G-d and only G-d has dominion over the world!

Shabbat Shalom.