In this brief video, Tara Sophia Mohr (not identified as a Christian) speaks in general about identifying your calling in life.
See video at end of this post…
I would note that this is just a simple motivation type talk where Tara speaks in general to anybody about their calling in life. What I took away from this is that this is exactly what you as a missionary need to understand and present to your potential missionary partners so that they understand your calling. One thing is that you are called (not all missionary candidates are called by the way), and another thing is to communicate that calling to others, especially those that support you, and those that potentially are considering supporting you. This means that you need to highly persuade them of your calling. The elements that Tara presents are very useful in this task.