Newton’s scientific discoveries included the fundamental laws of motion in the Universe, one of which says:
Every action always has an opposite and equal reaction.
When you apply the idea of gratitude to Newton’s law it says: every action of giving thanks always causes an opposite reaction of receiving. And what you receive will always be equal to the amount of gratitude you’ve given. This means that the very action of gratitude sets off a reaction of receiving! And the more sincerely and the more deeply grateful you feel (in other words, the more gratitude you give) the more you will receive.