What proverb is used in the story "Kabuliwala" by Rabindranath Tagore?

Two identifiable proverbs are implied in "Kabuliwala" by Rabindranath Tagore. They both relate to generosity and kindness.
At the end of the story, Mini's father displays kindness and generosity by giving the Kabuliwala money to travel to see his daughter again and also to have a fresh start in Afghanistan. He has been in prison for years for stabbing a man (after a quarrel related to pay for a shawl that he was indebted to him for) and his murderous action put a physical rift between he and Mini. It also darkened him in the eyes of Mini's father, who had not seen someone killed before:

The words gave me a sudden jolt. I had never seen a homicide before, so my heart flinched at the sight of the man.

At least one translation of the story says that Mini's father considers the appearance of the man on his daughter's wedding day to be a bad omen; another just says that he wished he would leave on such an auspicious day. Either way, it is clear the Kabuliwala is no longer welcome; Mini's father asks him to leave.
Despite this, Mini's father has a change of heart when he discovers the Kabuliwala carries around a paper with his daughter's hand print on it. He relates to the Kabuliwala as a father, and uncovers the true reason why the strange man spent so much time with Mini when she was younger. The Kabuliwala had a daughter in Afghanistan who he was working to provide for and years in prison separated him from her so long that he would now have trouble recognizing her, just as he had had trouble recognizing the full-grown Mini. The story describes this moment where it says:

It became obvious to him that his own daughter had grown up as well and he would have to get to know her all over again.

Mini's father then decides to act on the proverbs: "True happiness consists of making other people happy" and "Help thy brother's boat across, and lo, thine own has reached the shore":

I took out some money and gave it to him. "You go back to your daughter in Afghanistan, Rahamat, and may the happiness of your union bring blessings for my Mini too," I said.
I had to cut out one or two items from the eclat of the festivities for gifting that money. For example, the lighting decoration was not as gorgeous as I had wanted it to be, and the band party had to be canceled. This upset the woman, but buoyed by a benevolent spirit, my auspicious ceremony became more luminous.

Mini's father feels the joy of making a small sacrifice for another person, and he also expects that the act will bring good fortune on his own daughter in the future.