An onion, on its own, can never catch you by surprise. It's big and permeates an undeniable odor.
Each layer of an onion uncovers something new, though. It may be a new texture, a new color, or even a different smell.
Each situation, each opportunity, and even every person is akin to an onion in this way. Without opening it up and revealing the complexities of what's inside, we're not truly understanding its worth.