Even the biggest and brightest diamond is flawed; but that flaw does not distort its beauty nor prevent it from shining through the deepest and darkest environments.
We must not allow our present circumstances and emotions to prevent the fulfillment of our purpose. Just because you know your purpose does not imply that you no longer have to go through the process. In fact, it is the process- the stretching, pulling, and tugging that assists you with reaching the fulfillment of your purpose; ask the diamond. No pressure, no diamond.
Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.