All things are temporary

No matter what you try to prepare for, things will go awry and your creations will fall down. Nothing is ultimately concrete. You'll end up frustrated if you don't prepare for this fact. You can still create, and you can create beautiful things, and you can make significant changes; but if you assume that your changes will stick, you will be disappointed.

Communion

Communion is a multi-level phenomenon. You can experience communion at different levels and it means different things. There's a stripped-down survival-with-nature communion that we all know; there's a sexual communion that we also know; there's a magic egoic triumphant self-communion that so many games idolize; there's a Bearded-God communion at the mythic-sociocentric level; and from there the definition of "communion" gets fuzzier and more sophisticated. But it's there.

Evolution of culture

Species evolve over time, ecosystems evolve over time. The mechanism for this evolution is the death of individuals that are poorly adapted and the survival of individuals that are better adapted to their environment. (Any holes in evolutionary theory aside, this is the general mechanism.) The ecological system requires constant sacrifice of the specimen in order to keep the flow of energy moving.

Human culture also evolves; but this isn't driven by the deaths of individual people. Our growth cycle is a factor - so often it's the youth who are social change agents - but by and large, the "sacrifice" driving change is the communicative and relational inefficiency caused by miscommunications, misunderstandings, moral conflicts, et cetera. These frictions occur in the mental realm (the subtle realm?), not as physical things running around outside.

The battlefields there are every bit as volatile as any battle for survival in the physical world; indeed, when we collectively give mental "life" to collective entities such as companies, the assault of ideas can indeed be a matter of life or death. Scientism and religion have consistently how ardently, how passionately we can identify our Self with particular thoughts and beliefs.

Humanity is a rolling definition

What does it mean to be human? Our historical insistence on establishing a concrete, unchanging definition for humanity is informative in itself. Humanity is a rolling definition; we create our values and our human-ness through our interactions and choices and will continue to do so as we develop. To limit humanity to any concrete standards as against animals is to cap our growth as a species, and that is morally irresponsible.

Involution and Evolution: a metaphor for the recaptured-goodness and growth-to-goodness models

Wilber talks of evolution - Human reaching up to Spirit - and involution: Spirit reaching down to pull us up. Both evolution and involution are processes of our growth. Evolution fits with the "growth-to-goodness" idea that we are reaching for Heaven; involution fits with the "recaptured goodness" idea that we need to peel away imposed trappings to reach something that was originally had but subsequently lost.

Evolution is like evaporation; involution is like condensation. Both are necessary to sustain us. Both are central to the flow of energy and the process of life. In condensation, one adopts a more concrete form and falls away from the heavens to feed the Earth; in evaporation, the shining light of Eros excites you to enter a transformed state and rise up to join the clouds that are your birthright. You float with them, bask in the sun, gaze down on the world until you feel called to return to the fray.

But the raindrop, arriving in the ocean, feels a tragic loss and does not know how it happened.  The knowledge of the vistas from the heavens - perhaps those memories are too flightly, too formless to speak in a brain of water and matter? But the raindrop has a vague intuition that something has been lost, and seeks to refind it by returning upstream - a vain attempt, of course, as returning upstream goes against the nature of water itself.

Credits to KW for these inspirations. He writes beautifully on this topic in One Taste p 305-318.