A rational being cannot rationally consent to being used merely as a means to an end, so they must always be treated as an end.
He thus believed that a perfectly rational being must also be perfectly moral because a perfectly rational being subjectively finds it necessary to do what is rationally necessary.
With effort, rational beings can come to understand Zeus as a person, a rational being with thoughts and intentions like ours.
Is survival as a rational being a necessary means to literal, long-term survival?
It is the moral authority of each individual qua rational being.
Proving that an eternal, good and rational being created the universe would provide such a ground" (Lascano 2011, 743).
In De Statu Innocencie, the innocence into which we were created before the Fall, he says, is the optimal condition for any rational being.
This is the possibility of acting in ways that do not rely on "contingent, subjective conditions that distinguish one rational being from another" (5:21), and hence do not fall foul of others' demands for justification.
The parts of a watch are also possible only through their relation to the whole, but that is because the watch is designed and produced by some rational being.
Kant argued that the objective law of reason is a priori, existing externally from rational being.
To be inclined toward the perfection of another rational being is to be disposed to take pleasure in their perfection.
