I Thought I Could Help You, You Helped Me.

I was in the middle of watching a sermon on Youtube this morning when I kept getting this nagging thought about my calling. It's not an unfamiliar thought, just one that was so persistent I couldn't even finish the sermon. I have therefore spent the past 2 hours now trying to find scripture and stories in the Bible that align with what is perplexing me at the moment. The subject of the morning is purpose. 
One of the most exciting moments in my life was last year when I got the call for a job I'd...