The quote, "Not only are there no happy endings,’ she told him, ‘there aren’t even any endings" is a profound commentary on the nature of life and human experiences. It suggests that the concept of ‘endings’ as we traditionally understand them doesn’t truly exist. Life is not a storybook or a movie that has a clear-cut conclusion or a ‘happily ever after.’ Instead, it’s a continuous process of experiences, changes, and transformations.

What we often perceive as ‘endings’ are merely transitions into something new. For instance, the end of a relationship might be the beginning of personal growth, or the end of a job might open the door to new opportunities. In this sense, there are no real endings, just new beginnings.

As for the first part of the quote, "not only are there no happy endings," it can be interpreted as a critique of the narrative that life should or will always lead to happiness. Happiness is not a destination but a journey, a series of moments and not a final state to be achieved. Life is full of ups and downs, and the expectation of a continuous state of happiness is unrealistic and can lead to disappointment.

Applying this idea to today’s world or personal development, it encourages us to let go of rigid expectations and embrace the fluidity of life. It reminds us that change is the only constant, and that we should be open to it rather than resisting it in pursuit of a ‘happy ending.’

In personal development, this could mean focusing on the process rather than the outcome, and finding joy and growth in the journey itself. It encourages resilience, as we understand that what may seem like an ‘ending’ or a setback is merely a transition into a new phase.

In the context of the world, it suggests that societal progression is not linear or defined by clear ‘endings’ or ‘beginnings.’ Changes, whether they be social, political, or environmental, are ongoing processes and not isolated events. This perspective can help us better understand and navigate the complexities of our ever-changing world.