Reb Yitzchak Dovid Grossman shlita tells the following story:
A non-religious bachur from Netanyah, Eretz Yisrael, began keeping
Shabbos and started coming to the local beis medresh. A yungerman who
frequented that beis medresh offered to teach him Torah. The yungerman taught him the basics of hilchos Shabbos, kashrus, tefillah, and more, and the bachur grew in his Yiddishkeit.
There was something peculiar about this boy:
Each day he came to the beis medresh with a pocket bulging with sunflower seeds. From time to time, he would take a seed or two from his left pocket and put it in his right pocket. But the yungerman decided that he wouldn’t ask him about that, and they focused on learning Torah.
One evening, before they began studying, the yungerman said, "I didn’t eat
anything today. Lend me some of your sunflower seeds, so I will have
strength to learn with you." "I can't," the boy replied.
The yungerman was insulted. For months he tutored him for free, without
asking for a penny. And now, when he asks him for a minor favor, the
boy refuses. They learned for fifteen minutes, and then the yungerman said that he had to stop. He felt uncomfortable learning with a bachur who obviously didn’t appreciate everything he was doing for him. The next day the yungerman didn’t show up. The day after they learned, but it wasn't with the same enthusiasm and happiness like it used to be. Eventually, they stopped learning altogether.
One day, the bachur called up the yungerman and said, "You don’t owe me anything, but I want you to come to my house for a couple of minutes."
The yungerman came, and he saw barrels filled with sunflower seeds!
He was wondering what type of psychological syndrome this bachur
suffered from.
The bachur said, "When I became a baal teshuvah, I had a very strong yetzer hara to revert to my old ways. A rabbi advised me that I should put a lot of sunflower seeds into my left pocket, and whenever I do a good deed, I should place one of the sunflower seeds into my right pocket. When I come home at night, I count my good deeds and I store them in these barrels, so I can remember all the good deeds I'm doing. When you asked me for a few sunflower seeds, I refused, because at that time, all the seeds were in my right pocket and I had to leave them there so I could count them at the end of the day…"
We repeat this story as a reminder that one must focus on the good deeds he does. Don’t consider yourself lost from Hashem, because every Yid has many mitzvos. With this focus, you will be able to change your ways and do perfect teshuvah before Hashem.