When breeding animals, we expect the offspring to reflect the qualities of the parents.
It is the same in the spiritual realm. If we have fully embraced God as our Father, we will take on his character. And the overarching attribute of God is prodigious generosity. At least, that seems to be the clear meaning of Jesus' words:
You know the saying: Love your neighbor and hate your enemy. But I tell you, “Love your enemies. Bless those who curse you. Do good to those who hate you. Pray for people who are spiteful to you and torment you. This is how you live as children of your Father in heaven. Because he makes his sun rise on the evil and on the good. God sends rain on the just and on the unjust.
If you love those who love you, how could you imagine you would be rewarded for that? Even drug dealers do that! And if you pleasantly greet your own people, how is that remarkable? Even pagan foreigners do the same. Instead, be perfect as your Father which is in heaven is perfect. Matthew 5:43-48
Let us bask in the generosity of our God and pay it forward in our interactions with others.