The Mishnah (Avos 5:3) states, נסיונות עשרה בכלם ועמד השלום עליו אבינו אברהם נתנסה, "Avraham was tested ten times, and he passed all of them."
The Bas Ayin says that Avraham passed the ten tests because he had bitachon. He trusted that Hashem was leading him in the best way, and with this awareness, he was able to pass all tests. When Hashem told him לך לך, to leave his hometown and to travel, Avraham believed that the trip must be good for him, since it was Hashem's decree and request, so why shouldn't he agree to do so?
The Bas Ayin writes:
"It was certainly difficult for Avraham to leave his birthplace and his father's home, where he was raised and was accustomed to his entire life, and to go to a foreign land. He didn’t even know where he was going! But he trusted that Hashem only does kindness. His trust in Hashem gave him the strength to pass this difficult test. It states, חמש בן ואברם מחרן בצאתו שנה ושבעים, 'Avram was 75 years old when he left Charan.' 75 is the gematriya of בטחון. The pasuk is hinting that Avraham was able to pass this test and leave Charan because he had bitachon. With emunah and bitachon in the Creator of all worlds that everything He does is for the good, one has the strength to keep the mitzvos and to pass even the most difficult tests."
This is implied in the words (Tehillim 37:3) טוב ועשה 'בה בטח, "Trust in Hashem, and do good." When you trust in Hashem, you will be able to do many good deeds.
We bow four times in Shemonah Esrei, and each time, we stand up before we say Hashem's name. For example, at the beginning of Shemonah Esrei, we bow at the words אתה ברוך, and before we say 'ה, we stand up straight. The Gemara (Brachos 12a) states that this is because it states (Tehillim 146:8) כפופים זוקף 'ה, "Hashem straightens the bent." This means that before we say 'ה, we should stand up straight. Rabbeinu Yonah explains, "Standing up straight shows that one has bitachon in all matters of his life that Hashem will do good for him." When one has worries and problems, it is natural for him to walk about bent over and broken. But when one remembers that Hashem is taking care of him, he will walk with a straight posture. Therefore, when one davens and says Hashem's name, he should stand up straight to show that we have a Father in heaven Who always takes care of us, and we won't lack anything. So, why should we walk about with a bent back?"
It states (Shir HaShirim 7:8) לְתָמָר דָּמְתָה קוֹמָתֵ ךְ זֹאת, "Your stature is like a palm tree..." We can explain that we are like a palm tree that grows straight up, without any bends. This is the way the Jewish people are: they stand up straight. They aren't bent over from their tzaros. All this is due to their trust in Hashem.
It states (Tehillim 55:23) וְהוּא ָיְה ָבְך 'ה עַל הַשְׁלֵ ךְ ָיְכ ַלְכְּלֶך, "Cast your burden on Hashem, and He will sustain you." The Gemara (Rosh Hashanah 26b) states that the chachamim didn't know the meaning of the word ָיְה ָבְך. Rabba bar Chana said that he was once carrying a package, and a merchant rode by on his camel and said אגמלא ושדי ָיְה ָבְך שקול, "Take your package and throw it on the camel." This is how it was discovered that ָיְה ָבְך means package.
The package alludes to the heavy load of worries and problems people carry on their backs. This hefty load of worries causes one to be hunched over. But we can cast this package on Hashem, as it states, 'ה עַל הַשְׁלֵ ךְ ָיְכ ַלְכְּלֶך וְהוּא ָיְה ָבְך, "Cast your burden on Hashem, and He will sustain you." Stand up straight and trust in Hashem. Hashem will take care of you.
Zera Kodesh
(from Rebbe Naftali of Ropshitz zt'l, fifth night of Chanukah) writes, "A person might say, 'If I were a tzaddik, I could have bitachon ... But I know my deeds. I haven't done enough before Hashem yisbarach. How can I trust that Hashem will perform kindness for me? I don’t deserve it.' This thought is the yetzer hara. The truth is the exact opposite. Hashem is good and kind to all, לכל 'ה טוב ...ולטובים לרעים ומטיב הטוב. Therefore, בטחון comes from the word טיח, cement that connects. A person should connect himself to the path of bitachon and not leave it."
We add that this is alluded to in this week's parashah (15:6) צְדָקָה לּוֹ ָוַיַּחְשְׁבֶה 'בַּה וְהֶאֱמִן. Hashem promised Avraham that he would bear children, and Avraham believed that this would occur, as it states, 'בַּה וְהֶאֱמִן. But he didn't think that he would merit children because he deserved it, since Avraham was very humble, and he didn't think he deserved anything. As Avraham said (Bereishis 18:27) וְא ָנֹכִי וָאֵפֶר עָפָר, "I am dust and ashes." Instead, Avraham thought he would merit children solely because of Hashem's kindness. This is the meaning of צְדָקָה לּוֹ ָוַיַּחְשְׁבֶה. This can be translated to mean that Avraham considered Hashem's promise to be charity, kindness, not something he deserved.
