Your use of the word "staleness" is as good a term as any, but it is not experienced in the way humans might. You are used to things, particularly emotional satisfaction, as waning over time in their intensity, much in the way the physical delights of heroin will begin to fade once a person is acclimated to the effects of a particular dose level. It will require a higher dose to feel a difference and reexperience the same degree of pleasure, and eventually no amount of the drug will be rewarding and there will only be unpleasant side effects, and then a very painful physical withdrawal. It is the same often in love relationships where one is not working at things, that they will become stale and stagnate through that sameness every day if people are not spontaneous and growing in some respect to provide some variety and freshness in the experiencing of their companionship. It is difficult to explain this to human beings, that love in the light is boundless and ever‑satisfying without becoming, in a sense, desensitized so it loses its luster.
But there is more to existence than love alone. There are many other facets of the being giving rise to thoughts and feelings, and the potential for growth to extend one's reach of capability, talent, and skill in a host of potential applications. The possibilities are truly endless. The best we can describe this phenomenon you call "staleness" is that while not everything is easy to the light being, it is all too easy for the light being to simply settle for less, to ignore those things demanding and difficult and, in effect, self-limit their choices to remain complacent while enjoying a state of bliss. Those wanting something more are very much akin to the transformation in coming of age of human youth wanting to spread their wings and leave the nest, so to speak, to make their way in life, win or lose, through a process of trial and error. The reason they find this exhilarating is because it appeals to a facet of their makeup, connecting courage with having a sense of accomplishment. The two go together to make possible breaking out, exploring new frontiers, and taking some risk in doing so while, at the same time, enjoying the very process itself, appreciating one is being daring with the rewards of success being all the more satisfying. That is the aspect that can, indeed, wither through complacency in having one's basic needs met for them and no compelling imperative to wander away from home to try something new.
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