As Sarah Peck so wonderfully points out, cars have brakes not so they can go slow, but so they can go fast. Gravity doesn't just hold us down, it shows us how marvelous it is when we fly.
Heartbreak reminds us that love is so rare, so precious, and so important.
Age reminds us that wisdom comes with the price tag of time.
Winter makes sure that spring burst forth with vibrancy and color when it's time.
The thing that you think is holding you back may seem like a nuisance. But it's also reminding you - showing you - that hard work, dedicated effort, and intelligent action will surely have a reward.