What is the secret to Apple’s success? After introducing the iPad 2 in March, Steve Jobs offered one answer:

It’s in Apple’s DNA that technology alone is not enough — it’s technology married with liberal arts, married with the humanities, that yields us the results that make our heart sing — and nowhere is that more true than in these post-PC devices.

Steve Jobs’ resignation as CEO of Apple leaves the company without its founder and lead visionary, but still in very capable hands. As I’ve written, Tim Cook is better suited than anyone in the tech industry to run Apple and lead the company into...