According to LDS doctrine, what is the source of God's power? According to modern revelation - from an LDS perspective, what is the source of God's power? 

I'm looking for references from the standard works and quotes from the brethren that may indicate to us what God's power is and how it works.
This is a difficult question to answer. If you asked &quot;What is source of gravity?&quot;, what would the answer be? Matter? Matter has gravity.
Similarly, the answer to &quot;What is the source of God's power?&quot; is probably &quot;God&quot;. God has God's power. Perhaps that isn't really satisfying, but it's accurate.

Cleon Skousen, a famous LDS scholar, had interesting things to say about God's power.
Disclaimer: These are Skousen's insights, based firmly in LDS doctine, but his own beliefs nonetheless.
Most of this is from  a sermon &quot;A Personal Search for the Meaning of the Atonement&quot;. The recording and transcipt are available. Similar statements are also in his book The First 2,000 Years in &quot;The Source of God’s Power.&quot;
Skousen quotes Doctrine and Covenants 29:36:

for, behold, the devil was before Adam, for he rebelled against me, saying, Give me thine honor, which is my power; and also a third part of the hosts of heaven turned he away from me because of their agency;

God possesses power over the sea, the earth, the heavens because they honor him. And they honor him because he is who he is.
This honor is more than figurative; all things have an &quot;intelligence&quot;...for lack of better word, a fundamental spark of divinity/existence that cannot be created or destroyed (Pearl of Great Price, Abraham 3). This universe of intelligences honor God, and so he has power.
Alma 42 explains the necessity of Jesus's sacrifice for sin, to satisfy justice while offering mercy:

...except it were for these conditions, mercy could not take effect except it should destroy the work of justice. Now the work of justice could not be destroyed; if so, God would cease to be God.
...which repentance, mercy claimeth; otherwise, justice claimeth the creature and executeth the law, and the law inflicteth the punishment; if not so, the works of justice would be destroyed, and God would cease to be God.
What, do ye suppose that mercy can rob justice? I say unto you, Nay; not one whit. If so, God would cease to be God.

God would &quot;cease to be God&quot; if he were unjust. He would his lose his honor, and also his power. Of course, God is just and good, and will be yesterday, today, and forever, and so all things obey him, and he has all power in heaven and in earth.