Why is "Your will be done" not redundant? The question is about the words "Your will be done" (γενηθήτω τὸ θέλημά σου, Matthew 6.10)  in the Lord's prayer. I do not understand the meaning of it. My faith tells me that everything happens according to the Lord's will anyway, so why pray asking for this to happen if I believe that this is the only thing that can ever happen in any circumstances anyway?
The Lord's prayer as our daily statement of purpose and petition for support

My faith tells me that everything happens according to the Lord's will anyway, so why pray asking for this to happen if I believe that this is the only thing that can ever happen in any circumstances anyway?

I know you didn't mean it, but your statement implies fate / destiny, as though we have no role in God's will.  But in Christianity we are active participants, God's hands and feet in this world so to speak, in advancing His Kingdom on earth, battling Satan's forces that want to reduce His Kingdom.  A believer sees a Christian life as a battleground, as many hymns describe such as Onward Christian Soldiers.
Thus, when we say &quot;Your will be done&quot;, it is NOT an intellectual statement about God's sovereignty / power, but it's a soldier's decision to enlist in God's army.  The full text is &quot;Your Kingdom come, your will be done, on earth as it is in heaven.&quot;  God is fully established in heaven, but not yet on earth since Satan is still allowed to operate.  By saying that, as a member of God's army we declare our readiness to fight TODAY as well stating our petition for &quot;Give us our daily bread&quot; because we cannot fight on our own resources.
It is as though God asks us in the morning: are you willing to fight for me today?  God only asks for willing soldiers, because He respects our free will.  By saying &quot;Your Kingdom come, your will be done on earth as it is in heaven&quot; we declare our stance with God, similar to a pledge of allegiance to a country, that &quot;Yes, I'm with you, and I want to fight your cause in the world for the glory of your kingdom on earth.&quot;
In doing this we are imitating Jesus at Gethsemane, at the hardest stage of His own battle with evil:

&quot;Father, if you are willing, please take this cup of suffering away from me. Yet I want your will to be done, not mine.&quot;

The other 2 elements of the Lord's prayer are also present in Jesus's Gethsemane's passage as well (see Luke 22:39-46): daily bread (angels strengthening Jesus) and dealing with temptation.  Jesus had a choice: go with the war plan, or quit.  Just as he was successful against Satan's temptation during the 40 day fasting in the desert, he made a decision to align his own will with God's will, relying on God's strengthening.  That's the full meaning when we pray the Lord's prayer.
God's will and Our will
OP Comment (emphasis mine)

We make plans, and we change them occasionally. But God knows what we will finally do, in every case. None of our actions can alter His will, this is one of the things I believe most firmly - nobody's actions can prevent the will of God from being done, it is impossible.

Within Christianity there are different models of reconciling God's foreknowledge, our freedom of will (subjectively experienced), and God's providence (which includes various types of God's will).  Arminian, Reformed, and Catholic theologies each has their own model resulted from each tradition's various level of human depravity as well as various level of determinism of God's will.
Therefore the statement &quot;None of our actions can alter His will&quot; is not strictly true in the Arminian's view of God's providence which I answered here.  In Arminian theology there is a larger role of human's participation in God's plan to the extent that God will work around our free will !  The motto is &quot;God is in charge but not in control.&quot;
It's unfortunate that Christianity in the West has degenerated into intellectualism, but if we carefully read the Bible (both OT and NT), God demands an action response, not just intellectual agreement.  Human being consists of reason, will, and emotion and it only makes sense that God doesn't want compartmentalization but our full being.  Jesus keeps asking &quot;follow me&quot;.  Paul keeps exhorting &quot;imitate me to be slave of Jesus Christ&quot;.  James emphasizes &quot;faith without works is dead&quot;.  All believers are then called to purify our character (with the help of the Holy Spirit) and doing service in the world (with God's grace and opening of doors).  So it makes total sense to say the Lord's prayer as a prelude to action, a full human response to God's gift of salvation instead of merely an intellectual statement about God's will.