Stop thinking of them as restrictions that are holding you down; instead, try to see them as puzzles. And once those puzzles are solved, you’ll be left with something that’s much more creative had you never faced any obstacles.

That's exactly it. Obstacles shape the creative process, making it unique to each person.

A friend said to me, "I don't know how," is just the beginning—and the process of discovering how is where the energy from creativity comes from.