The more you know, the less you need.

“The more you know, the less you need. The experienced fly fisherman with only one rod, one type of fly, and one type of line will always outfish the duffer with an entire quiver of gear and flies. I never forget Thoreau's advice: 'I say beware of all enterprises that require new clothes...'"

—Yvon Chouinard in Let My People Go Surfing.
Chouinard is a mountain climber, environmentalist, and founder of Patagonia. He was writing about product design in the quote above.