Genesis 7:11, “… on that day, all the fountains of the great deep were broken up, and the windows of heaven were opened.”
The fountains of the deep are the hearts of mankind. As hard-heartedness is broken up and gratitude, worship and thanksgiving gush forth, the heavens respond in a torrent of Divine blessing.
Matthew 25: 29, “For to everyone who has, more will be given, and he will have abundance; but from him who does not have, even what he has will be taken away.”
The ones who “have” are the ones who focus on what God has given—even if it is little, even if it is in seed form. Those who “do not have” are those who are focused on their lack (ingratitude).
Gratitude forces the focus to shift on what one has rather than what one does not have. And what is focused upon multiplies! Abundance!