Thanking Hashem For Helping a Friend:

It is related that a shopkeeper once cried to Rav Moshe of Kobrin zy"a that he had very little parnassah. He said that very few customers came into his store. On the other hand, the neighboring store sold inferior merchandise but had a lot of customers and made a big profit.

Rav Moshe told him, “I guarantee you that if you are happy for your friend when you see that he has a lot of customers and you thank Hashem for giving him parnassah then you too will have an abundance of livelihood. It may be hard you to do this with a full heart, but once you do it once, it will become easier. Once you start saying it with your mouth, your heart will begin to truly feel it."

יִהְיֶה נִדַּחֲךָ בִּקְצֵה הַשָּׁמָיִם מִשָּׁם יְקַבֶּצְךָ ה' וגו' וּמִשָּׁם יִקָחֶךָ (ל, ד)

If your exiles will be at the end of the heavens, Hashem your G-d, will gather you from there, and He will take you from there. (30:4)