Happy Reformation Day!
490 years ago a monk named Luther sparked the protestant reformation by putting 95 points for public discussion up on the cathedral door in Wittenberg.
Luther and those who followed after him re-discovered that scripture is the sufficient and final authority in the Church, that God makes the ungodly righteous, that salvation is not earned, that God is free and sovereign, that all of life is Christ's, that the cross is able to fully save us and that the Church always needs reforming.
Here are all my posts with a 'reformation' tag. They're helpful mainly in the sense that they contain links to some good things said by other people about reformation.