[Our Sages] explained the verse "The LORD is your guardian, the LORD is your shade [protection] at your right hand", which presents a double difficulty. Since it says "The LORD is your guardian" why does it repeat "the LORD is your shade"? This teaches us that the Almighty is like a shadow. A shadow does what the person does; should a person close their hand, the shadow will close its hand, and should the person open their hand, so will the shadow open its hand. So it is with the Almighty, Who does as a person does. If one opens one's hand, the Holy One, blessed be He, opens His hand, and bestows unlimited blessings.