“I am not primarily an advocate of capitalism, but of egoism; and I am not primarily an advocate of egoism, but of reason. If one recognizes the supremacy of reason and applies it consistently, all the rest follows.”
— Ayn Rand
If I correctly understand her, Rand is mistaken in assuming reason is by itself sufficient. Even when consistently applied, reason alone usually doesn’t do us much good in establishing truths. At least not outside of pure logic and mathematics. One reason that’s the case is because reason so often leads us to two, three, four, or even more options — each one reasonable. If science relied on reason alone, nothing would ever be settled by science.
Reason needs observation to discipline it. Reason should always be checked against observation — otherwise reason too often leads to even the wildest sort of speculations. One of the reasons science has made so much progress in our understanding of the universe is because science combines reason and observation — rather than relying on reason alone. Science constantly tests reason against observation. In science, when observation disagrees with reason, observation triumphs.
At any rate, I felt like Randing ranting a bit. So, that’s my rant for the day.