It says my soul is pure. Even after the things I have done?
The Hebrew is in the present tense: tehorah hi, it is pure. Not "it was pure when I was born." And you say it every morning, including the morning after a bad day.
The Gemara lists five ways the soul is like God. One of them: "Just as God is pure, the soul is pure." Abudarham (the classic commentary on the prayers) quotes this and adds that the soul is pure because it was cut from a pure place. On that reading, "pure" describes where your soul comes from, not how you acted yesterday.
A second Gemara describes an oath every person is made to swear before being born. Part of it: "Know that God is pure, His servants are pure, and the soul He put in you is pure. If you keep it pure, good. If not, I will take it from you." The wording is close to our blessing. But in the oath, the guarding is your job.
So can a person ruin it? The sources do not all say the same thing. A third Gemara reads the verse "the spirit returns to God who gave it" as an instruction: give it back the way He gave it, pure. It tells of a king who hands out royal clothes to his servants. The wise return them clean. The foolish return them dirty. The Maharal (Rabbi Yehudah Loew of Prague, who died in 1609), explaining a view in the Gemara, writes that the soul is given pure, but in someone who sins it takes on impurity.
Rav Kook (the first Chief Rabbi of the Land of Israel, who died in 1935) reads the blessing differently. On the words "You guard it inside me," he writes that this purity is kept in the soul's own foundation "even through all our descents," and that only God could do such a thing. On his reading, "it is pure" stays true on your worst day.
Both views agree on the starting point. What you were handed is pure, and you did not make it. They differ on how much damage a person can do to it.
Berakhot 10a,Abudarham, Morning Blessings,Niddah 30b,Shabbat 152b,Maharal, Netivot Olam, Netiv Koach HaYetzer 4,Rav Kook, Olat Re'iyahI was only asleep. Why does it call me a dead body?
The blessing ends by calling God the one "who returns souls to dead bodies." In Hebrew, pegarim metim. It is a blunt way to describe someone who just had a night's sleep.
Abudarham takes the phrase piece by piece. "Who returns souls": because in the morning God gives us our souls back. "To dead bodies": because sleep is like death. He notes that Tanach itself speaks of death as sleep, and he quotes the Gemara: sleep is one-sixtieth of death, a small taste of it.
Now look at where the blessing comes from. On the same page, just before it, the Gemara gives the blessing for going to bed. One of its lines: "Light up my eyes, or I will sleep the sleep of death." The two blessings are a pair. At night you ask that this sleep not turn into the other kind. In the morning you say what happened.
Did the soul go anywhere? You were breathing all night. Bereishit Rabbah (the classic Midrash on the book of Bereishit) records two views. One: if God gathered in the soul completely, the person would die. So while a person sleeps, the soul stays and warms the body "so that it does not go cold and die." The other, in the name of Rabbi Meir: the soul fills the whole body, and when a person sleeps it goes up and draws life for him from above.
A detail in halacha shows how close waking up and coming back to life are in this blessing. The Mishnah Berurah (a central commentary on daily Jewish law, published 1884 to 1907) records a ruling: someone who forgot Elokai Neshama and already said the Amidah does not say it afterward, because "who revives the dead" in the Amidah is similar to "who returns souls." He adds that others question this.
So the blessing is not insulting you. In its language, every waking up is a small version of coming back to life.
Abudarham, Morning Blessings,Berakhot 60b,Berakhot 57b,Bereishit Rabbah 14:9,Mishnah Berurah 6:12How do I know I even have a soul?
The blessing does not argue that you have a soul. It starts from there. So do the sources behind it. What they do give you is a clear picture of what they mean by the word, and it may not be what you imagine.
Start with the Torah. God forms the first human from dust, breathes into him "the breath of life," and only then "the human became a living being." In that verse, the soul is the difference between a shaped body and a living person.
Bereishit Rabbah (the Midrash on Bereishit) says the soul has five names. Nefesh is the blood, the life of the body. Ruach is what "goes up and comes down." Neshama is a person's character or mind. Chaya means "living": all the limbs are lifeless, and it is alive in the body. Yechida means "the only one": every limb comes in a pair, and it is single. So the word covers your life, your mind, and whatever there is only one of in you.
The Gemara adds a comparison. The soul is to the body what God is to the world. It fills all of it. It sustains it. It sits in the innermost rooms. And it "sees and is not seen." That last one matters for your question. The Gemara is not saying you could find the soul if you looked hard enough. It is saying the soul is the one doing the looking.
None of this is a proof, and these sources do not offer one. They describe. You could agree that you are alive, aware and one of a kind, and still ask whether any of that outlasts the body. The blessing says it does: "You are going to take it from me, and return it to me in the time to come." That part is a belief, stated plainly.
What you can check for yourself is the smaller claim. You woke up. You are aware. There is one of you. You did not arrange any of it. That is where the blessing begins: "the soul You put in me."
Bereishit 2:7,Bereishit Rabbah 14:9,Berakhot 10a