We know our own brokenness.
It's a rare thing to find a person in our generation who thinks they have it all together. We have a hundred reasons why we can't lead or a hundred problems in our life that we just can't figure out.
Fifty years ago, most people would say: "I'm basically a good person."
More and more, now, you'll hear people saying: "I'm basically a broken person."
Ask around. Ask people if they've felt ashamed at all this week? What about guilty? What about rejected or dejected or subjected? If people could change one thing about their physical appearance, is there anything they would change? If people could change one thing about their personality or inner life, is there anything they would change? If people could change one relationship, would there be one broken and needing change?
We know our brokenness.
God's word talks about this brokenness as sin. In Romans it says that "all have sinned and fallen short of God's glory." Vulnerable ministry flows from an awareness of this truth.
We can't pretend to be perfect. The emperor has no clothes. We know our own brokenness and you'd better believe we'll have some good guesses about yours.
So, don't fake it. Pursue vulnerability in ministry.