The term 'rational spirit' is correct and usable in written English.
You can use it to refer to a person's capacity for reasoned thinking and analysis, particularly in terms of their ability to make decisions objectively. For example, "I am thankful for the rational spirit that allowed me to make the best decision for myself in this situation."
More importantly, we must have a rational spirit and help each other move forward.
Further, by approaching metaphysics and cosmology in an essentially rational spirit, the text prepared for the emergence of rationalistic Neo-Daoism.
This, like all La Roche's works, is imbued with the rational spirit of the Enlightenment and shows her interest in economic and social problems, including women's education.
We hope, in this critically important time of change in China and the rest of the world today, to carry forward the moral character and rational spirit bestowed to intellectuals by our history.
In this stirring historical novel, shortlisted for the 2009 Man Booker Prize, Viktor and Liesel Landauer commission a house in Czechoslovakia that is to embody the rational spirit of nineteen-twenties Europe: the Landauer House, with the transparent Glass Room as its center.
A French Esperantist, a lawyer named Alfred Michaux, described the committee's reaction: "One can hardly grasp the wonderment and scandal of these French intellectuals, with their Cartesian and rational spirit, representatives of lay universities and supporters of secular government, accustomed to and identified with freethinking and atheism, when they heard this flaming prayer".
For sensitive interpreters of phenomena, the ultimate intelligibility of nature has seemed to demand some rational guiding spirit.
In this theorization, democratization is expressed as the realization of an immanent human nature, whether acting in a republican or rational utilitarian spirit.
It is precisely in subjecting nature to experimentation and thereby to rational comprehension that spirit raises itself above nature.
In such moments, Trump presents himself as capitalist man, the spirit of rational calculation.
In the spirit of rational discourse, let's hear him out.
