The real wisdom here lies in recognizing that *difficulty itself is information*—the storms teach you what calm seas cannot. Most people hear "adversity builds character" and nod along, but Roosevelt is saying something subtler: without resistance, you literally lack the data to become competent. A surgeon who has never had to improvise during complications hasn't actually learned surgery yet; she's only learned the textbook version. The uncomfortable implication is that if your path feels smooth, you might not be becoming as capable as you believe.