Now although the diminutions of Divine energy / light are tens of thousands (of degrees)… millions.. in fact, infinite! until our world, which is finite is created – nevertheless, generally they are contained within three categories.
These are the universes of Beriah, Yetzirah, and Asiyah. In each Universe there are tens of thousands of different levels.
Now the world above them, the universe of Atzilus is Godliness.
Now in order to create the world of Beriah, where the Great Tzaddikim and the great angels have great comprehension of God, (and so, are not submerged within Him… because the fact that someone can comprehend… means that there is “another” comprehending) this necessitates an awesome Tzimtzum / the diminution of the Divine energy / light.
The same applies for the world of Yetzirah, as the light which is in the world of Beriah, relative to Yetzirah is infinite, and as such can only descend into Yetzirah through a Tzimtzum / diminution.
The same holds true from Yetzirah to Asiya.
Now the end goal of all these incredible Tzimtzumim / diminutions was to create the human, and the benefit of the reducing of the Kelipah and Sitra Achara – and the increase of light that comes due (to the rebound) from Darkness.
This occurs when the person elevates himself and his body and his soul powers /ability to God, through using them for Torah and Mitzvos.
And this is the entire purpose of Creation and man.
Now we know that emotions reflect each other, like the face peering into water / mirror.
As such, just as God set aside His infinite life / life to create you / limited beings – how much infinitely more so should man set aside his personal desires, to deeply attach themselves to God – and not allow any hindrances, whether within or without, even one’s love for his wife and children, his body, his money.
We now understand why our sages instituted two blessings prior to Shema etc. although as the Rashba says, they seem to have no connection to the Shemah – as such, why are they called the blessings of the Shema? and why do they preceed it?
The reason is because the main function of Shema is to arouse a love for your God, “with all your ‘hearts'” namely both your Yetzer Tov and the Yetzer Hara.
In other words, to overcome any challenge to serving God.
Now “your heart” refers to one’s wife and children, whom one’s heart is deeply attached to.
And your “soul” and your “might” of course refers to one’s body / health, and possessions.
To give up everything for the love of God.
Now how can a physical/corporeal human being, come to such an awesome selfless Love – it is for this reason that our sages instituted the recital of the praises of the Angels prior to Shema, for the angels are so great and yet God does not descend upon them – they say “Where is His glory?” On the nation of Israel!
And the lower Angels, the Oifanim and the Chayois Hakoidesh make a great noise, for they seek Godliness, but they cannot find its location.
The above is in regards to the first blessing of Shema and the Second Blessing emphasizes, that God abandons all of these great lofty angelic beings, and He is our personal God on Earth.
The reason He contracted, diminished Himself (His great infinite light so much) is because the nature of love is to make space for whom you love.
This is why it is called, “Love of the world” for He diminished Himself to such an extent, to create the world.
He did this all out of His great love for the Jewish people, in order to be able to draw them close, and that they should merge in His Infinity.
This is also the meaning that He chose us from all the nations, that even our physical body, which is similar to the bodies of all gentiles, have been chosen by God.
And He drew us close to unify in Him.
Now when somebody will think about these concepts, how God has condensed Himself due to His love for us, then reciprocally, face to face, the individual will feel such a strong love for God, that He is ready to abandon all his (perceived) limitations and cleave to God.
He will attach, “Spirit to Spirit,” which is the study of Torah.
And with “the mouth” he will say the words of Torah.
The reason it is important to say the words of Torah, and it is not enough just to comprehend them, is because the goal is to elevate the world, and when you use your body which was created through the nourishment from the mineral, plant and animal world, and you say the words of Torah, you then elevate the world to God.
This causes a manifestation of the Divine Light in the world, that His presence should shine within them.
This of-course is the entire purpose of the world, that the presence of God should shine within the physical, in the transformation of Darkness to light, and bitterness to sweetness.
This is the purpose of man’s existence, to bring the Divinity of God into the world.
However to accomplish this, a person has to First sacrifice themselves to God – have no other loves.