Someone told the Chazon Ish zt'l that doctors told him that he only had four more days to live because there was no cure for his illness. The Chazon Ish asked, "What did Hashem create on the first day of creation?" The man told him. "What did Hashem create on the second day?" The man told him. In this manner, they went through the first four days of creation. Then the Chazon Ish said, "If Hashem created so much in four days, he can certainly create a cure for you in four days, too." During those days, doctors discovered penicillin. His family from London sent him the medication, and he was cured. (Maaseh Ish vol.2 159).
It states (Tehillim 126:1) כחלמים היינו ציון שיבת את 'ה בשוב, "When Hashem will return the captivity of Tzion, we will be like dreamers." The pasuk refers to the era of Moshiach. At that time, we will look back at all the years in galus and consider them like a long, bad dream. When a person wakes up from a bad dream a moment earlier, he was going through the worst problems, but it is all over in a moment. He wakes up and all is well. The Midrash says (Tehillim 126:1) כחלמים היינו, means that when Moshiach comes, we will be like Yosef HaTzaddik, who was called (Bereishis 37:19) החלומות בעל, the person who dreamed. Yosef was sold into slavery in Mitzrayim, he was imprisoned, etc. He suffered immensely. But then Yosef became the leader of Mitzrayim, and all of his problems disappeared in a moment, and he was able to provide for his entire family during the hunger years. Initially, it seemed bad, but it was for the good, and the past was now viewed as a bad dream.
Rabbeinu Yonah (Mishlei 3:26) writes, "The obligation of bitachon is that a person should know in his heart that everything is from heaven. Hashem can change nature and change the mazel. There isn't anything preventing Hashem from bringing salvation. He should trust in Hashem at all times of distress and know that Hashem saves from all tzaros in a moment, with the blink of an eye. Therefore, he should hope for His salvation. Even if a sword is on his neck, he should trust Hashem... This is the meaning of the pasuk (Tehillim 62:9) ֵתע ָלבְכ בוֹ ְ חוּבִּט, trust in Hashem at all times, even when the tzarah is near and he doesn't have a plan or way how to save himself from it..."
It states (45:27) ֵאתָׂשל ֵףיוֹס ַחָלׁש ֶרֲׁשא ֲגָלוֹתָעה ֶתא וַיַּרְא ֶםֲבִיהא ֲקֹביַע ַרוּח ִיְּחוַת אֹתוֹ, "[Yaakov] saw the wagons that Yosef had sent to carry him, and the spirit of their father Yaakov was revived." Shem Mishmuel (45:27) explains that עגלות also means round, or wheels. "When a section of a wheel is down, it isn't considered down because it will go up again. And then it will do another circle. This is a great hint and mashal that whatever happens to a person, all yeridos (descents) aren't yeridos. The wise understand that it is the beginning of an ascent, and he should trust in Hashem that soon he will go back up. And when he goes up, he shouldn't be haughty because he will soon go down. This is the correct counsel that a Yid should never forget.
"This is what Yosef haTzadik sent to Yaakov. He sent him the עגלות to show him that even if he goes down to the bitter exile, in Mitzrayim – which is the root of all future exiles until Moshiach comes – it isn't a yeridah. It is עליה לצורך. Great benefits will come from it. Yosef sent wagons אותו לשאת, to raise Yaakov's spirits.
Yaakov understood that Yosef was constantly thinking these thoughts, all the time that he was in Mitzrayim. He understood that when Yosef was in Mitzrayim, he reminded himself that there would come a time when he would be on top again. ירידה עליה לצורך, the descent will result in an even better time in the future. Yaakov understood that such thoughts gave Yosef chizuk all these years in Mitzrayim, and with these thoughts, he survived there, although there was no hope in sight. Therefore, יעקב רוח ותחי אביהם, this gave Yaakov hope, as well, to know that even if going down to Mitzrayim is a descent, it will result in an ultimate ascent.
