Another source for the important and fundamental aspect of bitachon in the life of the Jew is the first words that a Jew says in the morning
Modeh Ani Lefanecha
I say thanks in front of You, Hashem,
Melech Hai V’Kayam
The king that is alive in lasting
Shehezarta Bi Nishmati B’Hemlah
That You gave back my soul with kindness, with compassion.
Raba Emunatecha
Your loyalty is very strong.
This is based on a pasuk in Eicha 3,23,
חֲדָשִׁים֙ לַבְּקָרִ֔ים רַבָּ֖ה אֱמוּנָתֶֽךָ
Every morning we wake up refreshed, Your loyalty is great.
And at night before we go to sleep, we say B’Yadcha Afkid Ruchi/in Your hand, I deposit my soul.
That means I'm putting my deposit in the bank and I'm relying on the FDIC that I can take my soul out, that the ‘money’ will be there in the morning.
The Zohar says that really, a person owes God so much that it’s like you owe the bank money. If you make a deposit to your bank account and you owe the bank money, they're going to take that towards the money you owe them. But Hashem doesn't do that. You relied on Him; you counted on Him to give you back your Neshama, so He'll give it back to you, even though you're not deserving of it. That is the reliability of Hashem.
We must appreciate this
every morning when we get up.
Think of this mashal-
Let’s say I owe someone $10,000, and I ask him to watch my bicycle for a day or two. He should really keep my bicycle, but the bicycle that I give him is dented and dirty. I just went mountain biking with it.
Then, when I ask him for the bicycle back two days later, it comes back all shiny and new. All the dents are taken out and it's clean. That's unbelievable. That's a lot of Hemlah. Besides the loyalty, that he gave it back to me, there is compassion in n that he cleaned it up. And that’s what happens to us. We go to sleep at night tired and weary, and we give our souls to God. Then we get up in the morning and we're refreshed. HaNoten L’Ya’ef Koach.
That's how reliable God is. That's our morning lesson in God's reliability. We have to know that.
One of the prerequisites of Bitachon is that God is reliable. You can count on Him and He comes through for you.
That's what we’re supposed to be thinking every morning when we say Modeh Ani, but most of us don't really look at going to sleep and getting up this way. We just think it's a natural phenomenon- you go to sleep at night and you get up in the morning. We don't have the spiritual eyes to see our souls leaving us, we can’t see that B’Yadcha Afkid Ruchi/I am giving my soul to You, and Padita Oti/You redeem me every single night. We don't see that. We think we hear a noise and jump up. But No, your soul is going back into your body. It's a reality- so much so, that we do need to do Netilat Yadayim every single morning. Why do we do Netilat Yadayim in the morning? Because, just like when a person passes away and their soul leaves, there's a contamination that comes in (That's why dead body contaminate- because the soul leaves, and whenever the holiness leaves, the contamination comes to fill the vacuum), so too, every night when we go to sleep, our souls leaves us, to a certain degree, and contamination comes in. Therefore we must wash our hands in the morning.
These are all realities that we don't see with our eyes. We don't appreciate this. We think we just go to sleep and get up.
But no, we're actually depositing our souls in God's hands. The concept of a person dying in his sleep is real. If you read Keriat Shema Al HaMitah, before you go to sleep, it says, “I shouldn't fall asleep, the sleep of death.”
When a person is going to sleep, they're actually giving up their soul. We're relying on God to give it back to us in the morning.
And therefore, our first statement of the morning is “God is reliable. I counted on Him and He came through for me.”
Have a wonderful day.

