Noun
practical reason (uncountable)
(philosophy) The use of reason to decide how to act.
Since, in the long run, every planetary society will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring - not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive. Carl Sagan
The practical reason for freedom is that freedom seems to be the only condition under which any kind of substantial moral fiber can be developed - we have tried law, compulsion and authoritarianism of various kinds, and the result is nothing to be proud of. Albert Jay Nock
The only objects of practical reason are therefore those of good and evil. For by the former is meant an object necessarily desired according to a principle of reason; by the latter one necessarily shunned, also according to a principle of reason. Immanuel Kant
When I was a child and teenager I read whenever I had the opportunity, but since then I've found it hard to read as much as I'd like, children, work, and pets all providing powerful incentives to escape into a book and a practical reason why I rarely do so. Louise Brown
We do not act because we know, but we know because we are called upon to act; the practical reason is the root of all reason. Johann Gottlieb Fichte
Now I am working on an 'Ethics' à la Spinoza. It is designed to establish the highest principles of all philosophy, in which theoretical and practical reason are united. I have become a Spinozist! Don't be astonished. You will soon hear how. Baruch Spinoza