Vernünftiges sein wollen?

Question

I am striving with translating an old philosophy text:

Nur der Vernünftige kann somit vernünftig und Vernünftiges sein wollen.

How would you rephrase the last "Vernünftiges" (sein wollen) in modern German and/or translate it to English?

Answer 1

A bit more of a context may help, but this fits quite well:

And so, only the reasonable can be reasonable and be wanting to be something reasonable.

Answer 2

Thus only the reasonable one might strive for reasonability, be it either in kind or existence.

The author is referring to being comprised by reasonability as a whole, as opposed to merely wielding it as a tool of leisure.