Vayechi

One part of the bracha that Yaakov gave Yehuda was חכלילי עינים מיין ולבן שנים מחלב ,Red eyed from wine, and white toothed from milk.
Rashi interprets this to mean that Yehuda will have an abundance of wine & milk.

In the gemara, Reb Yochanan has an interesting take on these words. He says that these words teach us that greater is one who smiles at his friend than one who feeds him. Although it says  ולבן שנים מחלב , read it as it’s better ליבון שינים, showing the white of your teeth, your smile, מחלב than material goods. As it says in אבות דרבי נתן you could give someone all the gifts in the world but if you do it begrudgingly, with a sour face, it means nothing. However, one who greets his friend with a smile, even if he gives him nothing, it’s as if he gave him everything.
What's so great about a smile? What does it really do?

There's a story told over by רב זילברשטיין that, at one of the rabbinical conventions where רב משה פיינשטיין זצ"ל & the פני מנחם מגור were participants, רב משה asked the rebbi to speak & introduced him as a גברא רבה , a great man.
The rebbi got up and said that if the פוסק הדור asks me to speak I have no choice. Let me explain, however, what he meant by calling me a גברא רבה.

The gemara says how foolish are those that stand up for a Sefer Torah but don't stand up for a גברא רבה a great man. For we see in the Torah that it is written that one who gets lashes gets forty; yet, the rabbis come along and say it means only thirty nine. See how much honor we should have for the rabbis since the Torah gave them the power to interpret & make changes.

Nevertheless, continued the rebbi, we see that someone who saves a Jew from being hit even one more time, thereby lessening this Jew’s pain, is considered a גברא רבה . So, too, I, who take hours from my day listening to all the problems of the people & comforting them as best as I can, can be called a גברא רבה which is why רב משה asked me to speak.
Sometimes all it takes is a smile & a kind word, to listen to someone else & ease their pain.

This is demonstrated, as well, by Moshe Rabbainu, says the sefer עלי שור. The gemara relates that the last thing Moshe did was separate three cities to be cities of refuge for the accidental murderer. Then, Hashem said to him הזרחת שמש לרוצחים , you let the sun shine for the murderers, praising him for setting aside the cities of refuge. Moshe Rabbainu , our greatest leader, found no other mitzva to do right before his death than to help out the downtrodden. He started out וירא בסבלותם seeing their troubles & ended with הזרחת שמש , making it easier for the downtrodden troubled ones.
How can we reach this goal? How do we learn to smile at everyone & try to help?

In the bracha of Hamalach, Yaakov said, וידגו לרב they should be abundant like fish. פורת יוסף asks, what are the good points of being compared to fish? He answers, that there is no evil eye & they multiply לרוב , greatly. However, the evil component of fish is that whichever is the bigger one, swallows the smaller one. Therefore, the bracha was  וידגו לרב without the "ו" so that they would be compared to fish only in the good points & not the bad.

Maybe that's how we could learn to smile at everyone. If we can train ourselves to only look at the good in people & not see the bad, then it will be much easier to smile at them & want to help. The Torah is teaching us here to only look at the good in people, no matter what kind of person they are & want to help them. By so doing & showing people that you care about them we will be making the world a better place!