Considering, (not surprising, given my reading), the evolution mankind has undergone in terms of his thinking. (I use the terms "his", "him", "man" etc. in a gender-indifferent fashion, please don't waste my time with any politically correct gender-fascism.)
First - there is language. "In the beginning was the word...". Nothing we have done before or since has come close. Language both defines ourselves, our world and our place within it. This beginning with the word, common not just to Christianity and Judaism but a thousand different creation myths across as many cultures - this is not an accident.
Think - there are tribes (some still in existence) - that cannot distinguish between green and blue, and have to be taught the difference gradually with colored cards, have to be taught that there is a difference and then to discriminate between them.
There are arguments that even as recently as a few thousand years ago humans didn't "see blue", or not certainly as we see it today. And think of how language has evolved - across different cultures, to reflect our current epoch. The evolution of language since the invention of the World Wide Web, even, a relatively short span, how many new phrases have come into vogue? First - uncommonly to describe things that were imagined, yet not in existence, and then again commonly to describe them when they had been brought into existence.
And there are other languages, of which most of us know nothing - the language of musicians, notes, keys, clefs, of painters, whose language must naturally encompass a richer vocabulary for hue and texture, whose eye must discriminate, the jargon of a thousand unrelated professions from Priest through doctor, computer programmer, lawyer, each with a common tongue, but each as well with his own unintelligible vocabulary that allows him communion with his peers.
Language - note - not written language - but oral traditions, folklore, is what defines us, changes us, Christianity an excellent example of a myth destroyed by writing it down, in it's innumerable translations having lost almost all of it's symbolism and meanings, lost - through history, distance, through a general inability of the written word to convey over time the breadth, magnitude and symbolism of living experience.
Math, which I had considered separately but reconsidered - it's own language - but language as well, Math, the invention of (was math discovered? Or invented?) which facilitated architecture - the building of the pyramids, of Ancient Egypt, Greece, Rome, of spaceflight and - if we should as a species live to see it - interstellar travel. And each addition to Math's language - for example the 0, Pi, then negative numbers, prime numbers, and a thousand other concepts beyond the scope of this post - each led on to countless new discoveries and achievements. And - marvel then, that each discovery or invention follows almost as a matter of necessity from the one before it.
"In the beginning was the word...", and if you are to believe it, this makes us Gods.
How, then, can we make it better? What changes in language will improve our lot?
Now, this is a good jumping off place, considering the different cultures across the world, and how their language shapes them, defines experiences that you can't have or recognize unless you speak their language, think of what is lost when a language goes extinct, and think of what we can add to ours to make the future a more interesting place...