An excerpt from Leading with Confidence, a downloadable resource from GiftedForLeadership.com:
Paul's entire reason for confidence is rooted in the character of God himself - not what Paul did or didn't see going on around him. He's absolutely certain of one thing: God is in control. Period.
This, of course, is a great mystery to us. How does God take into account Satan's fierce, evil opposition, along with the free will he gave humans, and still promise he can work everything together for good?
I have no idea. God never promises I'll understand him, but he does ask me to trust him. Believing that God is sovereign is vital for confident living. We know from all his writings that Paul trusted not only that God is sovereign, but also that his character is faithful and good (1 Thessalonians 5:24). It's critical for Christians to believe this, too. Why?
Because without these additional attributes, we could view an absolutely sovereign God as a potential big bully. If I can't trust that God is always good and faithful, then God goes on trial with each particular circumstance of my life. I become the doubter who's like the waves of the sea, always being tossed about (James 1:6).
Of course, it's easy to say I'm confident that God's faithful when I've escaped a negative situation, but is he still faithful when the friend I've lifted up in prayer for more than 30 years has never returned to faith in Jesus? Or when I was diagnosed with breast cancer two years ago and had to face chemotherapy? The truth is, either God is faithful and good in all these situations, or he's faithful and good in none. How we decide between these opposite choices determines whether we live with confidence (and peace) or anxiety.