It's often easier for us to believe God's sovereignty when things go well in our life. But, when things go bad, when there is lying and mistrust, and betrayal and death, then our confidence in God's invisible purposes starts to get shaky. In Acts 1:15-26 we learn the ugly and tragic story of Judas's betrayal and death was actually part of God's invincible purposes in accomplishing salvation. The Scripture had to be fulfilled and God can be trusted to provide everything we need to be witnesses of Jesus.