Happiness is a feeling of the fulfillment of desire. It is possible only when there is a desire, hunger, passion, and it is fulfilled, realized. But as soon as a desire has been fulfilled and realized, the feeling of happiness gradually disappears. Thus, two constants are needed for happiness: a) desire, b) fulfillment.
In order for fulfillment not to cancel the desire, they need to be separated, to be in two objects. For example, a mother and a baby; a mother can endlessly enjoy a baby because she fills the object outside of herself.
If we create a connection above our mutual rejection, we will be able to fulfill each other and enjoy our actions indefinitely. There is only a purely psychological problem of understanding that the goal of creation is in pleasure and that the means to achieve the eternal and infinite pleasure is in “love thy neighbor as thyself.” This state is called the upper world. When we feel it, the sensation of our temporary flawed world—what is felt only in oneself—disappears.