Emotions are currency. In the tarot they are represented by the element of water and by the cups that contain them. Working with water element means also working with the structures in which it flows.
We often hear the phrase "you vote with your money." Well it can be said we also vote with our emotions. The (e)motion propels us through timelines in the astral fields. Since physical manifestations trail behind our astral 4D environment, that is where the reality-experience follows. If you intensely and consistently maintain an emotion, over time you will be propelled into an area that is energetically a match, and the trails of physical manifestation will follow and reach you there. If you don't leave this area you will see the deepening impressions of that frequency into your reality-experience until it manifests in the physical.
Every emotion you allow is in fact "a vote" towards the reality you are choosing. This is not a hard and fast rule of course and does not necessarily apply to specific karmic situations the Soul has created in the form of life agreements or soul-contracts, or any such contracts the Soul has been deceived or manipulated into. Okay with that mouthful out of the way for clarity's sake, it is still useful to consider the day-to-day emotional currency we are spending.